@misc{AL_1991_30_4_a6,
     title = {Sessions of the seminar {{\textquotedblleft}Algebra} i {Logika{\textquotedblright}}},
     journal = {Algebra i logika},
     pages = {505},
     year = {1991},
     volume = {30},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1991_30_4_a6/}
}