%0 Journal Article %A M. S. Agranovich %T On Series with Respect to Root Vectors of Operators Associated with Forms Having Symmetric Principal Part %J Funkcionalʹnyj analiz i ego priloženiâ %D 1994 %P 1-21 %V 28 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1994_28_3_a0/ %G ru %F FAA_1994_28_3_a0