A note on subdirectly irreducible groupoids Tomáš Kepka (1981) Acta Universitatis Carolinae. Mathematica et Physica
Exponentiation without associativity Gary Birkenmeier (1983) Acta Universitatis Carolinae. Mathematica et Physica
Graphs and associative triples in quasitrivial groupoids Tomáš Kepka, Jan Kratochvíl (1984) Commentationes Mathematicae Universitatis Carolinae
On a class of subdirectly irreducible groupoids Tomáš Kepka (1981) Acta Universitatis Carolinae. Mathematica et Physica
On some classes of point algebras Marshall Saade (1971) Commentationes Mathematicae Universitatis Carolinae
Semigroup representations of medial groupoids Jaroslav Ježek, Tomáš Kepka (1981) Commentationes Mathematicae Universitatis Carolinae