@article{AL_1971_10_2_a6,
     author = {K. K. Andreev},
     title = {Letter to the editors},
     journal = {Algebra i logika},
     pages = {226--228},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1971_10_2_a6/}
}