Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1971_7_6_a15, author = {Ya. I. Shatyro}, title = {The first boundary value problem for a certain ultraparabolic equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1089--1096}, publisher = {mathdoc}, volume = {7}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_6_a15/} }
Ya. I. Shatyro. The first boundary value problem for a certain ultraparabolic equation. Differencialʹnye uravneniâ, Tome 7 (1971) no. 6, pp. 1089-1096. http://geodesic.mathdoc.fr/item/DE_1971_7_6_a15/