Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1977_13_2_a7, author = {V. D. Gatabon}, title = {A boundary value problem for a system of second order equations of composite type}, journal = {Differencialʹnye uravneni\^a}, pages = {290--293}, publisher = {mathdoc}, volume = {13}, number = {2}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_2_a7/} }
V. D. Gatabon. A boundary value problem for a system of second order equations of composite type. Differencialʹnye uravneniâ, Tome 13 (1977) no. 2, pp. 290-293. http://geodesic.mathdoc.fr/item/DE_1977_13_2_a7/