(Selected) mainly-pre-2004 bibliography on (mono)unary algebras --------------------------------------------------------------- surveys and books ----------------- Skornjakov, L. A., Unars, in: Universal algebra, Colloq. Math. Soc. Janos Bolyai, 29, North-Holland, 1982, 735-743; MR: 83f:08013; Zbl 0504.08006 [AVAIL: CWI] J.Pitkethly and B.Davey, Dualisability. Unary Algebras and Beyond, Springer, 2005 1969 ---- Fajtlowicz, S., Families of independent sets in finite unary algebras, Colloq. Math. 20, 13-15 (1969); Zbl 0209.04203 Wenzel, G. H., Automorphism groups of unary algebras on groups, Canad. J. Math. 21(1969), 1165--1171; MR 42#174; Zbl 0209.04301 1970 ---- Senft, J. R., On weak automorphisms of universal algebras, Bull. Acad. Polon. Sci. Se'r. Sci. Math. Astronom. Phys. 18(1970), 115--118; MR 41#8325; Zbl 0231.08006 Senft, James R., On weak automorphisms of universal algebras, Dissertationes Math. Rozprawy Mat. 74(1970), 35 pp.; MR 43#142 Varlet, J.C., Endomorphisms and fully invariant congruences in unary algebras $\langle A; \Gamma \rangle$, Bull. Soc. R. Sci. Lie`ge 39, 575-589 (1970); Zbl 0212.34901 1972 ---- Berman, Joel, On the congruence lattices of unary algebras, Proc. Am. Math. Soc. (1972); Zbl 0226.08001 1977 ---- Egorova, D.P., Unars with a congruence lattice of a special form (in Russian), Studies in Algebra, Saratov, Interuniv. Sci. Collect. 5, 3-19 (1977); Zbl 0392.08004 Egorova, D.P.; Skornjakov, L.A., On the congruence lattice of unary algebras (in Russian) Ordered Sets and Lattices, Saratov, Interuniv. Sci. Collect. 4, 28-40 (1977); Zbl 0392.08005 Skornyakov, L. A., Group unars, Vestnik Moskov. Univ. Ser. I Mat. Mekh. 1977, no. 5, 65--69; Mosc. Univ. Math. Bull. 32, No.5, 52-55 (1977); MR: 81h:08005; Zbl 0412.08005 1978 ---- Abrhan, Imrih, ${\cal I}$-subalgebras in unary algebras, prime ideals and ${\cal I}$-ideals in groupoids and in semigroups (in Russian), Math. Slovaca 28 (1978), no. 1, 61--80; MR 80g:08010; Zbl 0384.08004 Chvalina, Jan, Characterizations of certain monounary algebras. I, Arch. Math. (Brno) 14 (1978), no. 2, 85--97; MR 80e:08005a; Zbl 0388.08006 Chvalina, Jan, Characterizations of certain monounary algebras. II, Arch. Math. (Brno) 14 (1978), no. 3, 145--153; MR 80e:08005b; Zbl 0402.08006 Egorova, D.P., The congruence lattice of a unary algebra (in Russian), Uporyad. Mnozhestva Reshetki 5, 11-44 + table (1978); Zbl 0402.08004 Kopecek, Oldrich, Representation of ordered classes by classes of connected unary algebras, Arch. Math. (Brno) 14 (1978), no. 4, 201--205; MR 80a:06002; Zbl 0402.08005 Pa'lfy, Pe'ter Pa'l, On certain congruences lattices of finite unary algebras, Comment. Math. Univ. Carolinae 19 (1978), no. 1, 89--95; MR 57#12352; Zbl 0382.06007 Skornjakov, L.A., Unary algebras with regular endomorphism monoids, Acta Sci. Math. 40, 375-381 (1978); Zbl 0371.08001 Smirnov, D.M., On the relation between regularly defined varieties of unary algebras and semigroups, Algebra Logika 17, 468-477 (1978); Zbl 0415.08004 1979 ---- Bulman-Fleming, Sydney; McDowell, Kenneth, The category of mono-unary algebras, Algebra Univers. 9, 339-345 (1979); Zbl 0425.08003 Deuber, Walter, Partition theorems for unary algebras, Discrete Math. 27, 35-45 (1979); Zbl 0442.08004 Kollar, J., The category of unary algebras, containing a given subalgebra. I, Acta Math. Acad. Sci. Hung. 33, 407-417 (1979); Zbl 0415.08003 Smirnov, D.M., Correspondence between regular varieties of unary algebras and semigroups, Algebra Logic 17, 310-315 (1979); Zbl 0427.08002 Sulka, Robert, Remark on partially ordered sets, universal algebras and semigroups, Math. Slovaca 29 (1979), no. 2, 131--139; MR 81g:08004; Zbl 0414.20052 1980 ---- Chvalina, J., On connected unars with regular endomorphism monoids, Arch. Math., Brno 16, 7-13 (1980); Zbl 0463.08003 Kartashov, V. K., Quasivarieties of unars, Mat. Zametki 27 (1980), no. 1, 7--20, Math. Notes 27 (1980), no. 1--2, 5--12; MR 81d:08011; Zbl 0429.08004 Kartashov, V. K., Quasivarieties of unary algebras with a finite number of cycles Algebra i Logika 19 (1980), no. 2, 173--193; Algebra Logic 19, 106-120 (1981); MR 82d:08006; Zbl 0462.08003 Kollar, J., The category of unary algebras containing a given subalgebra. II, Acta Math. Acad. Sci. Hung. 35, 53-57 (1980); Zbl 0461.08005 Sichler, J, Group-universal unary varieties, Algebra Universalis 11 (1980), no. 1, 12--21; MR 82a:08006; Zbl 0449.08003 1981 ---- Bartol, Wiktor, Subalgebra lattices of mono-unary algebras, Algebra Univers. 12, 66-69 (1981); Zbl 0461.08006 Chvalina, Jan, Note on compatible binary relations on algebras, Arch. Math. (Brno) 17 (1981), no. 4, 185--190; MR 84a:08003; Zbl 0475.08003 De'nes, J., Unary algebras and random number generators, Notes on algebraic systems, III, pp. 1--22, Karl Marx Univ. Econom., Budapest, 1981; MR 83m:08007; Zbl 0484.65007 Egorova, D.; Kartashov, V.; Skornyakov, L., On the variety of heterogeneous unars (in Russian), Algebraic systems, Interuniv. Collect. Sci. Works, Ivanovo, 1981, 122-133 (1981); Zbl 0528.08005 Kopecek, Ivan, Distinguishing subsets in general algebras, Casopis Pest. Mat. 106 (1981), no. 1, 94--100; MR 82e:08004; Zbl 0464.08001 Kurinnoj, G.Ch., On definability of a unar by congruences, Sov. Math. 25, No.3, 84-87 (1981); Izv. Vyssh. Uchebn. Zaved., Mat. 1981, No.3, 76-78 (1981); Zbl 0475.08004 1982 ---- [book82]: n-ary structures, Proc. Symp., Skopje/Yugosl. 1982, (1982) Ada'mek, J.; Strecker, G. E., On the largest initial completion of categories of algebras. Categorical aspects of topology and analysis (Ottawa, Ont., 1980), pp. 1--15, Lecture Notes in Math., 915, 1982; MR 83g:18002; Zbl 0479.18001 Cupona, G.; Celakoski, N.; Samardziski, A., Post theorems for unary algebras, [book82], 71-84; Zbl: 0575.08003 Cupona, G.; Celakoski, N., Representations of unary algebras in unars, Prilozi, Makedonska Akad. Nauk. Umet., Odd. Mat.-Tekh. Nauki 3, No.2, 5- 12 (1982); Zbl 0543.08004 Egorova, D.P.; Skornyakov, L.A., Regular quasivarieties of unars (in Russian) [book82], 103-108; 0579.08005 Lampe, W. A.; Taylor, W., Simple algebras in varieties, Algebra Universalis 14 (1982), no. 1, 36--43; MR 83e:08012; Zbl 0486.08008 Nelson, Evelyn, Homomorphisms of mono-unary algebras, Pac. J. Math. 99, 427-429 (1982); Zbl 0451.08005 Plonka, Jerzy, On the sum of a system of disjoint unary algebras corresponding to a given type, Bull. Acad. Polon. Sci. Se'r. Sci. Math. 30 (1982), no. 7-8, 305--309; MR 85c:08009; Zbl 0506.08004 Polak, Libor, Weak automorphisms of 1-unary algebras, Universal algebra and applications, Semester 1978, Banach Center Publ. 9, 273-275 (1982); Zbl 0509.08010 1983 ---- A'da'm, A., On certain partitions of finite directed graphs and of finite automata, Acta Cybern. 6, 331-346 (1983); Zbl 0554.05031 Bochkin, A. M., Unary algebras with a separative monoid of endomorphisms, Izv. Vyssh. Uchebn. Zaved. Mat. 1983, no. 5, 71--74, Soviet Math. (Izv. VUZ) 27 (1983), no. 5, 86--90; MR 85c:08007; Zbl 0523.08005 Evans, Trevor; Ganter, Bernhard, Varieties with modular subalgebra lattices, Bull. Aust. Math. Soc. 28, 247-254 (1983); Zbl 0545.08010 Gil'man, E.A., Irreducible elements of lattices of universal classes, Sov. Math. 27, No.12, 70-73 (1983); Izv. Vyssh. Uchebn. Zaved., Mat. 1983, No.12(259), 58-60 (1983).; Zbl 0537.08007 Graczynska, Ewa, Proofs of unary regular identities, Demonstr. Math. 16, 925-929 (1983); Zbl 0544.08006 Kopecek, Oldrich, $\vert End A \vert = \vert Con A \vert = \vert Sub A \vert = 2\sp{\vert A\vert}$ for any uncountable 1-unary algebra, Algebra Univers. 16, 312-317 (1983); Zbl 0525.08005 Samardziski, A.; Celakoski, N., A note on normed directed multigraphs and unary algebras, Proc. 3rd Algebraic Conf., Beograd 1982, 123-129 (1983); Zbl 0532.05059 Skornyakov, L.A., Schreier and Hall varieties of unary algebras, Mosc. Univ. Math. Bull. 38, No.3, 27-32 (1983); Vestn. Mosk. Univ., Ser. I 1983, No.3, 24-28 (1983); Zbl 0524.08006 1984 ---- Babaev, V.G.; Nasibov, Eh.S., On endomorphisms of unary, almost simple algebras (in Russian), Mathematics and mechanics, Mater. 5th Repub. Conf. Young Sci., Vol. I, Baku 1984, 56-59 (1984); Zbl 0625.08003 Bochkin, A.M., Unary algebras with commutative monoid of endomorphisms (in Russian), Properties of semigroups, Interuniv. Collect. sci. Works, Leningrad 1984, 3-14 (1984). Zbl 0563.08005 Chvalina, Jan; Matouskova', Kvetoslava, Coregularity of endomorphism monoids of unars, Arch. Math., Brno 20, 43-48 (1984); Zbl 0552.08005 Ivanov, A.A., Complete theories of unars, Algebra Logic 23, 36-55 (1984); Algebra Logika 23, No.1, 48-73 (1984); Zbl 0546.08006 Novotny', Miroslav, On a relationship between monoids and monounary algebras, Cas. Pest. Mat. 109, 277-285 (1984); Zbl: 0558.08005 Pa'lfy, P.P., Unary polynomials in algebras. I. Algebra Univers. 18, 262-273 (1984); Zbl 0546.08005 Szendrei, A'gnes, Demi-primal algebras, Algebra Univers. 18, 117-128 (1984); Zbl 0542.08002 Zelinka, Bohdan, Tolerances on monounary algebras, Czech. Math. J. 34(109), 298-304 (1984); Zbl 0546.08001 1985 ---- Kartashov, V.K., Lattices of quasivarieties of unars, Sib. Math. J. 26, 346-357 (1985); Sib. Mat. Zh. 26, No.3(151), 49-62; Zbl 0584.08005 1986 ---- Goralci'k, Pavel; Koubek, Va'clav, Verifying nonrigidity, Inf. Process. Lett. 22, 91-95 (1986); Zbl 0587.68042 Ivanov, A.A., Complete theories of unars, Sib. Mat. Zh. 27, No.1(155), 57-69 (1986); Sib. Math. J. 27, 45-55 (1986); Zbl 0588.08003 Khusainov, B.M., Strongly effective unars and non-autoequivalent constructivizations (in Russian), Some problems of differential equations and discrete mathematics, Interuniv. Collect. Sci. Works, 33-44 (1986); Zbl 0679.03010 1987 ---- Bordalo, G., Representing finite relative Stone algebras by monounary algebras, General algebra, Proc. Conf., Salzburg/Austria 1986, Contrib. Gen. Algebra 5, 45-60 (1987); Zbl 0647.06003 Bordalo, Gabriela, Forbidden substructures in some kinds of lattices (in Portuguese), Proc. 2nd Meet. Portuguese algebraists, Porto/Port. 1987, 45-49 (1987); Zbl 0639.06007 Khusainov, B.M., Strongly $\forall$-finite theories of unars, Math. Notes 41, 151-154 (1987); Mat. Zametki 41, 265-271 (1987); Zbl: 0662.03026 Luka'cs, E., Globals of G-algebras, Houston J. Math. 13, 241-244 (1987); Zbl 0629.08002 Plonka, Ernest, Remarks on weak automorphisms of 1-unary algebras, Demonstr. Math. 20, No.1/2, 185-190 (1987); Zbl 0665.08003 Ryslinkova', Jana, Church-Rosser property and decidability of monadic theories of unary algebras, RAIRO, Inf. The'or. Appl. 21, 323-329 (1987); Zbl 0639.03008 1988 ---- Kucera, Ludek; Trnkova', Vera, Isomorphism testing of unary algebras, SIAM J. Comput. 17, No.4, 673-686 (1988), Zbl 0665.68029 Ryaskin, A.N., The number of models of complete theories of unars Tr. Inst. Mat. 8, 162-182 (1988); AMS Transl., 195, 285-307 (1999); Zbl 0675.03022 Sizyj, S.V., Finitely approximable unars, Mat. Zametki 43, No.3, 401-406 (1988); Math. Notes 43, No.3, 230-233 (1988); Zbl 0651.08003 1989 ---- Bedu"rftig, Thomas, Another characterization of the natural numbers, Z. Math. Logik Grundlagen Math. 35, No.2, 185-186 (1989); Zbl 0653.08002 Bestsennyj, I.P., Quasiidentities of finite unary algebras, Algebra Logic 28, No.5, 327-340 (1989); Algebra Logika 28, No.5, 493-512 (1989); Zbl 0703.08004 Bordalo, G., A duality between unary algebras and their subuniverse lattices, Port. Math. 46, No.4, 431-439 (1989); Zbl 0689.06009 Daderkin, D.O., On truth-table unoids (in Russian), Algebraic-logical constructions, Collect. Sci. Works, Kalinin, 19-24 (1989); Zbl 0738.03011 Daderkin, Dmitri O., On a class of unoids, Logic at Botik, Proc. Symposium on logical foundations of computer science, Pereslavl-Zalessky/USSR 1989, Lect. Notes Comput. Sci. 363, 91-100 (1989); Zbl 0673.03021 1990 ---- Cupona, G.; Celakoski, N., Transformations of Booleans, Mat. Bilt. 14, 15-26 (1990); Zbl 0784.08006 Kurinnoj, G.Ch., $S$-pasted sum of lattices, Algebra Logic 29, No.4, 301-309 (1990); Algebra Logika 29, No.4, 452-463 (1990); 0746.06002 Novotny', Jiri', On the characterization of a certain class of monounary algebras, Math. Slovaca 40, No.2, 123-128 (1990); Zbl 0734.08003 Novotny', Jiri', Automorphisms of cyclic monounary algebras (in Czech), Kniznice Odb. Ved. Spisu Vys. Uc. Tech., Brno, B 128, 39-47 (1990); Zbl 0734.08002 1991 ---- Bordalo, G.H., Frattini extensions of unary algebras, Demonstr. Math. 24, No.1/2, 7-14 (1991); Zbl 0768.08001 Novotny', Miroslav, Construction of all strong homomorphisms of binary structures, Czech. Math. J. 41(116), No.2, 300-311 (1991); Zbl 0735.08005 Sichler, J.; Trnkova', V., On automorphism groups of unary algebras and of their reducts, Houston J. Math. 17, No.2, 251-270 (1991); Zbl 0751.08001 Toffalori, Carlo, 1-ary functions and the f.c.p., Ill. J. Math. 35, No.3, 434-450 (1991); Zbl 0716.03027 1992 ---- Seselja, Branimir; Tepavcevic, Andreja, On CEP and semimodularity in the lattice of weak congruences, Zb. Rad., Prir.-Mat. Fak., Univ. Novom Sadu, Ser. Mat. 22, No.1, 95-106 (1992); Zbl 0804.08001 1993 ---- Ge'cseg, F.; Ju"rgensen, H., Algebras with dimension, Algebra Univers. 30, No.3, 422-446 (1993); Zbl 0795.08005 Ryaskin, A.N., Lascar rank and the finite cover property for complete theories of unars, Algebra Logic 32, No.6, 376-385 (1993); Algebra Logika 32, No.6, 690-706 (1993); Zbl 0820.03022 1994 ---- Abrhan, Imrich; Satko, Ladislav, $r$-systems of unary algebras. I: On maximal and greatest $J$-classes of the direct product of unary algebras, Math. Slovaca 44, No.1, 55-68 (1994); Zbl 0799.08006 Abrhan, Imrich; Satko, Ladislav, $r$-systems of unary algebras. II: Maximal and minimal subalgebras of the direct products of unary algebras, Math. Slovaca 44, No.1, 69-83 (1994); Zbl 0819.08002 Bordalo, G.; Priestley, H.A., Rees congruences in lattice-ordered algebras, Publ. Math. 45, No.3-4, 355-364 (1994); Zbl 0818.06005 Khoussainov, Bakhadyr, Recursive unary algebras and trees, Ann. Pure Appl. Logic 67, No.1-3, 213-268 (1994); Zbl 0804.03031 1995 ---- Seselja, Branimir, Lattice powers of unars, Zb. Rad., Prir.-Mat. Fak., Univ. Novom Sadu, Ser. Mat. 25, No.2, 121-129 (1995); Zbl 0897.06010 1996 ---- Jakubi'kova'-Studenovska', Danica, Retract irreducibility of connected monounary algebras I, Czech. Math. J. 46, No.2, 291-308 (1996); Zbl 0870.08006 Jakubi'kova'-Studenovska', Danica, Two types of retract irreducibility of connected monounary algebras, Math. Bohem. 121, No.2, 143-150 (1996); Zbl 0863.08007 Novotny', Miroslav, Construction of all homomorphisms of groupoids, Czech. Math. J. 46, No.1, 141-153 (1996); Zbl 0905.20048 Ploscica, Miroslav; Zelina, Miron, Cancellation among finite unary algebras, Discrete Math. 159, No.1-3, 191-198 (1996); Zbl 0859.08003 Radeleczki, Sa'ndor, The automorphism group of unary algebras, Math. Pannonica 7, No.2, 253-271 (1996); Zbl 0858.08002 Reichel, Mario, Bi-Homomorphismen und Hyperidentita"ten, Diss., Potsdam: Univ. Potsdam, Math.-Naturwiss. Fak. vi, 132 p. (1996); Zbl 0856.08006 1997 ---- Jakubi'kova'-Studenovska', D., Retract irreducibility of connected monounary algebras. II, Czech. Math. J. 47, No.1, 113-126 (1997); Zbl 0897.08005 Jakubi'kova'-Studenovska', Danica, Retract varieties of monounary algebras, Czech. Math. J. 47, No.4, 701-716 (1997); Zbl 0897.08006 Kurinnyj, G.Ch., Congruences and quasiidentities on unars, Ukr. Math. J. 49, No.6, 953-959 (1997); Ukr. Mat. Zh. 49, No.6, 852-856 (1997); Zbl 0932.08003 Novotny', Miroslav Homomorphisms and strong homomorphisms of relational structures, Arch. Math., Brno 33, No.1-2, 57-64 (1997); Zbl 0909.08001 Wismath, Shelly L., Unary hyperidentities for type $\langle 1\rangle$ algebras, Discuss. Math., Algebra Stoch. Methods 17, No.1, 105-111 (1997); Zbl 0909.08005 1998 ---- [book98]: Contributions to general algebra 10. Selection of lectures given at the conference on general algebra, Klagenfurt, Austria, May 29--June 1, 1997. Klagenfurt: Verlag Johannes Heyn. (1998). [ISBN 3-85366-890-9/pbk]; Fried, E.; Sichler, J., On endomorphisms and automorphisms of monounary algebras, Acta Sci. Math. 64, No.1-2, 13-36 (1998); Zbl 0906.08004 Haluskova', Emi'lia, On iterated direct limits of a monounary algebra, [book98], 189-195; Zbl 0912.08003 Jakubi'kova'-Studenovska', Danica, [book98], 207-214; Zbl 0916.08002 Jakubi'kova'-Studenovska', Danica, Antiatomic retract varieties of monounary algebras, Czech. Math. J. 48, No.4, 793-808 (1998); Zbl 0951.08001 Jakubi'kova'-Studenovska', D., Monounary algebras and bottleneck algebras, Algebra Univers. 40, No.1, 59-72 (1998); Zbl 0935.08003 1999 ---- Agliano, Paolo; Baker, Kirby A., Congruence intersection properties for varieties of algebras, J. Aust. Math. Soc., Ser. A 67, No.1, 104-121 (1999); Zbl 0951.08003 Haluskova', Emi'lia, Direct limits of monounary algebras, Czech. Math. J. 49, No.3, 645-656 (1999); Zbl 1004.08003 Jakubi'kova'-Studenovska', Danica, Retract irreducibility of monounary algebras, Czech. Math. J. 49, No.2, 363-390 (1999); Zbl 0953.08004 Jakubi'kova'-Studenovska', Danica, Retract injective hull of a monounary algebra, Chajda, I. (ed.) et al., Contributions to general algebra 11. Proceedings of the Olomouc workshop '98 on general algebra, ``56. Arbeitstagung Allgemeine Algebra", Olomouc, Czech Republic, June 12-14, 1998 and of the summer school '98 on universal algebra and ordered sets, Velke' Karlovice, Czech Republic, August 31-September 5, 1998. Klagenfurt: Verlag Johannes Heyn. 127-136 (1999). [ISBN 3-85366-926-3/pbk]; Zbl 0948.08002 Plonka, E., Structure of weak automorphism groups of mono-unary algebras, Algebra Univers. 42, No.1/2, 1-7 (1999); Zbl 0977.08003 2000 ---- [book2000]: Dorninger, D. (ed.) et al., Contributions to general algebra 12. Proceedings of the 58th workshop on general algebra ``58. Arbeitstagung Allgemeine Algebra", Vienna, Austria, June 3-6, 1999. Klagenfurt: Verlag Johannes Heyn. (2000) [ISBN 3-85366-951-4/pbk] Gao, Su, A dichotomy theorem for mono-unary algebras, Fundam. Math. 163, No.1, 25-37 (2000); Zbl 0955.03049 Haluskova', Emi'lia, Monounary algebras with two direct limits, Math. Bohem. 125, No.4, 485-495 (2000); Zbl 0966.08005 Haluskova', Emi'lia, Algebras with one and two direct limits, [book2000], 211-219; Zbl 0963.08002 Jakubi'kova'-Studenovska', Danica, Unoriented graphs of monounary algebras; Discrete Math. 222, No.1-3, 167-179 (2000); Zbl 0965.08004 Jakubi'kova'-Studenovska', Danica, On homogeneous and 1-homogeneous monounary algebras, [book2000], 221-224; Zbl 0965.08005 Kartashova, A.V., Topology lattices of unary algebras, Russ. Math. Surv. 55, No.6, 1152-1153 (2000); Usp. Mat. Nauk 55, No.6, 141-142 (2000); Zbl 1011.08007 Weaver, George, Homogeneous and universal Dedekind algebras, Stud. Log. 64, No.2, 173-192 (2000); Zbl 0957.08003 2001 ---- Degen, Wolfgang, Rigid unary functions and the axiom of choice, Math. Log. Q. 47, No.2, 197-204 (2001); Zbl 1001.03042 Jakubi'kova'-Studenovska', Danica; Ko"vessiova', Gabriela, On $\alpha$-pseudodimension of monounary algebras, Acta Univ. M. Belii, Ser. Math. 9, 51-60 (2001); Zbl pre02074207 Kartashova, Anna, Cardinalities of lattices of topologies of unars and some related topics, Discuss. Math., Gen. Algebra Appl. 21, No.2, 129-137 (2001); Zbl 1002.08001 Kravchenko, A.V., Complexity of lattices of quasivarieties for varieties of unary algebras, Mat. Tr. 4, No.2, 113-127 (2001); Sib. Adv. Math. 12, No.1, 63-76 (2001); Zbl 1017.08005 2002 ---- Chajda, Ivan; La"nger, Helmut, A note on normal varieties of monounary algebras, Czech. Math. J. 52, No.2, 369-373 (2002); Zbl 1011.08006 Clark, D.M.; Davey, B.A.; Pitkethly, J.G., Binary homomorphisms and natural dualities, J. Pure Appl. Algebra 169, No.1, 1-28 (2002); Zbl 0996.08004 Haluskova', Emi'lia, Two element direct limit classes of monounary algebras, Math. Slovaca 52, No.2, 177-194 (2002); Zbl 1007.08004 Hyndman, Jennifer, Mono-unary algebras are strongly dualizable, J. Aust. Math. Soc. 72, No.2, 161-172 (2002); Zbl 1020.08002 Jakubikova'-Studenovska', Danica, Homogeneous monounary algebras, Czech. Math. J. 52, No.2, 309-317 (2002); Zbl 1010.08003 Musilova', Karla, Graph endomorphisms of finite monounary algebras, J. Electr. Eng. 53, No.12/s, 115-118 (2002); Zbl 1038.08003 Novotny', Miroslav, Homomorphisms of algebras, Czech. Math. J. 52, No.2, 345-364 (2002); Zbl 1010.08004 Pitkethly, J.G., Dualisability and algebraic constructions, Acta Sci. Math. 68, No.3-4, 571-591 (2002); Zbl 1026.08005 Pitkethly, J.G., Strong and full dualisability: Three-element unary algebras, J. Aust. Math. Soc. 73, No.2, 187-219 (2002); Zbl 1012.08005 Weaver, George; George, Benjamin, Quasi-finitely characterizable and finitely characterizable Dedekind algebras, Bull. Sect. Log., Univ. Lo'dz, Dep. Log. 31, No.3, 145-157 (2002); Zbl 1031.03059 Weaver, George; Thompson, Edward, Hermes algebras, Bull. Sect. Log., Univ. Lo'dz, Dep. Log. 31, No.4, 217-229 (2002); Zbl 1031.03060 2003 ---- Bogdanovic, S.; Ciric, M.; Imreh, B.; Petkovic, T.; Steinby, M., On local properties of unary algebras, Algebra Colloq. 10, No.4, 461-478 (2003); Zbl 1032.08002 Jakubi'kova'-Studenovska', Danica, On 2-homogeneity of monounary algebras, Czech. Math. J. 53, No.1, 55-68 (2003); Zbl 1014.08005 Jakubi'kova'-Studenovska', Danica, On a cancellation law for monounary algebras, Math. Bohem. 128, No.1, 79-83 (2003); Zbl 1014.08006 Kartashova, A.V., On lattices of topologies of unary algebras, J. Math. Sci., 114, No.2, 1086-1118 (2003); Zbl 1040.08004 Koubek, V., Universal topological unary varieties, Topology Appl. 127, No.3, 425-446 (2003); Zbl 1041.18004 Weaver, George; George, Benjamin, The Fraenkel-Carnap question for Dedekind algebras; Math. Log. Q. 49, No.1, 92-96 (2003); Zbl 1015.03044 Zelinka, Bohdan, Algebraic approach to locally finite trees with one end, Math. Bohem. 128, No.1, 37-44 (2003); Zbl 1010.05019 2005 ---- Danica Jakubikova-Studenovska, On a representation of monounary algebras, Czechoslovak Math. J. 55(2005), N1, 157 - 164 Danica Jakubikova-Studenovska, Representation of Connected Monounary Algebras by Means of Irreducibles, Czechoslovak Mathematical Journal Volume 55, Number 4 December 2005 Pages: 1067 - 1078 2006 ---- M. Bianchi, A. Gillio, and L. Verardi -- Monounary simple algebras, Ischia Group Theory 2004: Proceedings of a Conference in honour of Marcel Herzog (ed. Zvi Arad et al.), Contemporary Mathematics 2006; Volume: 402