@misc{AL_2011_50_4_a7,
     title = {Sessions of the seminar {``Algebra} {i~Logika''}},
     journal = {Algebra i logika},
     pages = {553},
     publisher = {mathdoc},
     volume = {50},
     number = {4},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2011_50_4_a7/}
}