%0 Journal Article %A M. B. Kapilevich %T Tricomi’s singular problems in the neighborhood of a finite and infinite singular line %J Doklady Akademii Nauk %D 1961 %P 1053-1056 %V 137 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1961_137_5_a12/ %G ru %F DAN_1961_137_5_a12