%0 Journal Article %A V. D. Belousov %T Systems of orthogonal operations %J Sbornik. Mathematics %D 1968 %P 33-52 %V 6 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1968_6_1_a2/ %G en %F SM_1968_6_1_a2