%0 Journal Article %A G. G. Kazaryan %T The comparison of differential operators and differential operators of constant strength %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1974 %P 94-118 %V 131 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1974_131_a8/ %G ru %F TM_1974_131_a8