%0 Journal Article %A V. I. Liberzon %A V. S. Shul'man %T Nondegenerate operator algebras in spaces with an indefinite metric %J Izvestiya. Mathematics %D 1973 %P 529-534 %V 7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1973_7_3_a3/ %G en %F IM2_1973_7_3_a3