%0 Journal Article %A M. G. Gasymov %A F. G. Maksudov %T The principal part of the resolvent of non-self-adjoint operators in a neighborhood of spectral singularities %J Funkcionalʹnyj analiz i ego priloženiâ %D 1972 %P 16-24 %V 6 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1972_6_3_a2/ %G ru %F FAA_1972_6_3_a2