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- Automata and algebras in categories / Jiří Adámek, Věra Trnková . Dordrecht : Kluwer academic publ., 1990 . 470 s. [1, currently available 1]
- Combinatorial, Algebraic and Topological Representations of Groups, Semigroups and Categories / Aleš Pultr, Věra Trnková . Praha : Academia, 1980 . 372 s. [1, currently available 1]