1. Cs�k�ny, B.,On affine spaces over prime fields, Acta Sci. Math.37 (1975), 33?36.
2. Cs�k�ny, B.,All minimal clones on the three-element set, Acta Cybernet.6 (1983), 227?238.
3. Cs�k�ny, B. andMegyesi, L.,Varieties of idempotent medial quasigroups, Acta Sci. Math.37 (1975), 17?25.
4. Crvenkovi?, S. andDudek, J.,Rectangular groupoids, Czechoslovak Math. J.35 (1985), 405?414.
5. Dudek, J.,Number of algebraic operations in idempotent groupoids, Colloq. Math.21 (1970), 169?177.