%0 Journal Article %A L. P. Tepoyan %T Degenerate first order differential-operator equations %J Proceedings of the Yerevan State University. Physical and mathematical sciences %D 2019 %P 163-169 %V 53 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/UZERU_2019_53_3_a3/ %G en %F UZERU_2019_53_3_a3