Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1976_12_8_a13, author = {V. S. Kostin}, title = {The smoothness of the solutions of certain equations of parabolic {type.~I}}, journal = {Differencialʹnye uravneni\^a}, pages = {1495--1506}, publisher = {mathdoc}, volume = {12}, number = {8}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_8_a13/} }
V. S. Kostin. The smoothness of the solutions of certain equations of parabolic type.~I. Differencialʹnye uravneniâ, Tome 12 (1976) no. 8, pp. 1495-1506. http://geodesic.mathdoc.fr/item/DE_1976_12_8_a13/