@article{AL_2004_43_1_a0,
     author = {B. M. Vernikov},
     title = {A {Weaker} {Version} of {Congruence-Permutability} for {Semigroup} {Varieties}},
     journal = {Algebra i logika},
     pages = {3--31},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2004_43_1_a0/}
}