[1] CHAJDA I., DUDA J.:
Finitely generated relations and theiг applications to permutable and n-permutable varieties. Coment. Math. Univ. 23, 1982, 41-54.
MR 0653350
[2] CSKÁCY B.:
Characterizations of regulaг varieties. Acta Sci. Math. Szeged, 31, 1970, 187-189.
MR 0272697
[3] GRÄTZER G.:
Two Maľcev-type theorems in univeгsal algebra. J. Comb. Theory, 8, 1970, 334-342.
MR 0279022
[4] WERNER H.:
A Maľcev condition on admissible relations. Algebгa Univ. 3, 1973, 263.
MR 0330009