%0 Journal Article %A D. N. Ivanov %T An analogue of a theorem of Wagner for orthogonal decompositions of the matrix algebra %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1994 %P 237-238 %V 49 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1994_49_1_a12/ %G en %F RM_1994_49_1_a12