@article{AL_2004_43_6_a0,
     author = {B. M. Vernikov},
     title = {Semigroup {Varieties} on {Whose} {Free} {Objects} {Almost} {All} {Fully} {Invariant} {Congruences} are {Weakly} {Permutable}},
     journal = {Algebra i logika},
     pages = {635--649},
     publisher = {mathdoc},
     volume = {43},
     number = {6},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2004_43_6_a0/}
}