02B10
- : The non-axiomatizability of the observational predicate calculus (generalized Trachtenbrot's theorems). (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 1, pp. 41-57
- : О подполугрупповых графах. (Russian) [On Subsemigroup Graphs]. Matematický časopis, vol. 20 (1970), issue 2, pp. 135-140
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