@article{UZERU_2019_53_3_a3,
     author = {L. P. Tepoyan},
     title = {Degenerate first order differential-operator equations},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {163--169},
     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2019_53_3_a3/}
}