Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1961_136_2_a3, author = {V. I. Zhegalov}, title = {Boundary value problem for a mixed-type equation of higher order}, journal = {Doklady Akademii Nauk}, pages = {274--276}, publisher = {mathdoc}, volume = {136}, number = {2}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_2_a3/} }
V. I. Zhegalov. Boundary value problem for a mixed-type equation of higher order. Doklady Akademii Nauk, Tome 136 (1961) no. 2, pp. 274-276. http://geodesic.mathdoc.fr/item/DAN_1961_136_2_a3/