%0 Journal Article %A I. R. Shafarevich %T Deformations of commutative algebras of class~2 %J Algebra i analiz %D 1990 %P 178-196 %V 2 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_1990_2_6_a12/ %G ru %F AA_1990_2_6_a12