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@article{AL_1990_29_4_a3, author = {A. N. Zubkov}, title = {Varieties of pro-$p$-groups of second-order matrices}, journal = {Algebra i logika}, pages = {430--451}, publisher = {mathdoc}, volume = {29}, number = {4}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1990_29_4_a3/} }
A. N. Zubkov. Varieties of pro-$p$-groups of second-order matrices. Algebra i logika, Tome 29 (1990) no. 4, pp. 430-451. http://geodesic.mathdoc.fr/item/AL_1990_29_4_a3/