Permutability of congruences in varieties with idempotent operations Ivan Chajda (1991) Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica Similarity:
Lattices in quasiordered sets Ivan Chajda (1992) Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica Similarity: