Groupoids and the associative law IX. (Associative triples in some classes of groupoids) Aleš Drápal, Jaroslav Ježek, T. Kepka (1997) Acta Universitatis Carolinae. Mathematica et Physica Similarity:
Commutative distributive groupoids Tomáš Kepka (1978) Acta Universitatis Carolinae. Mathematica et Physica Similarity:
Some remarks on distributive groupoids Józef Dudek (1981) Czechoslovak Mathematical Journal Similarity: