%0 Journal Article %A G. I. Èskin %T Elliptic pseudodifferential equations with a~first order degeneracy %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1970 %V 25 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1970_25_4_a18/ %G ru %F RM_1970_25_4_a18