[1] FRASER G. A., HORN A.:
Congruence relations in direct products. Proc. Amer. Math. Soc. 26, 1970, 390-394.
MR 0265258 |
Zbl 0241.08004
[2] CHAJDA I.:
Regularity and permutability of congruences. Algebra Univ., 11, 1980, 159-162.
MR 0588209 |
Zbl 0449.08007
[4] WERNER H.:
A Mal'ev condition for admissible relations. Algebra Univ., 3 1973, 263.
MR 0330009