[1] CHAJDA I.: Regularity and peгmutability of congruences. Algebra Univ. 11, 1980, 159-162. MR 0588209

[2] CHAJDA I.: Coherеnce, regularity and permutability of congruences. Algebra Univ., 17, 1983, 170-173. MR 0726270

[3] DRAŠKOVIČOVÁ H.: Modular median algebras. Math. Slovaca 32, 1982, 269-281. MR 0670003 | Zbl 0491.08010

[4] FRIED E., PIXLEY A. F.: The dual discriminator function in universal algebra. Acta Sci. Math. (Szeged) 41, 1979, 83-100. MR 0534502 | Zbl 0395.08001

[5] GEIGER D.: Coherent algеbras. Notices of Amer. Math. Soc. 21, 1974, A-436, 74T-A130.

[6] TAYLOR W.: Uniformity of congruences. Algebra Univ. 4, 1974, 342-360. MR 0376483 | Zbl 0313.08001

[7] WERNER H.: A Maľcev condition on admissible гelations. Algebгa Univ. 3, 1973, 263. MR 0330009