%0 Journal Article %A L. N. Lyakhov %T Compactness and pseudocompactness of singular pseudodifferential operators %J Differencialʹnye uravneniâ %D 1983 %P 1025-1032 %V 19 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1983_19_6_a12/ %G ru %F DE_1983_19_6_a12