%0 Journal Article %A M. G. Gasymov %A A. M. Magerramov %T Investigation of a class of differential operator pencils of even order %J Doklady Akademii Nauk %D 1982 %P 277-280 %V 265 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1982_265_2_a3/ %G ru %F DAN_1982_265_2_a3