Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1957_116_5_a9, author = {P. E. Sobolevskii}, title = {On equations with operators forming an acute angle}, journal = {Doklady Akademii Nauk}, pages = {754--757}, publisher = {mathdoc}, volume = {116}, number = {5}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_116_5_a9/} }
P. E. Sobolevskii. On equations with operators forming an acute angle. Doklady Akademii Nauk, Tome 116 (1957) no. 5, pp. 754-757. http://geodesic.mathdoc.fr/item/DAN_1957_116_5_a9/