Quasigroups having at most three inner mappings Tomáš Kepka (1989) Acta Universitatis Carolinae. Mathematica et Physica Similarity:
Simple quasigroups whose inner permutations commute Tomáš Kepka, K. K. Ščukin (1993) Commentationes Mathematicae Universitatis Carolinae Similarity: Simple quasigroups with commuting inner permutations are medial.