%0 Journal Article %A A. A. Kuleshov %T Perturbations by compact operators of pseudodifferential equations in spaces of the type $B_{p,k}(R^n)$ %J Differencialʹnye uravneniâ %D 1975 %P 382-384 %V 11 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1975_11_2_a20/ %G ru %F DE_1975_11_2_a20