Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1988_24_1_a20, author = {M. M. Zainulabidov}, title = {The {Tricomi} problem when the line of change of type of the equation is closed}, journal = {Differencialʹnye uravneni\^a}, pages = {177--178}, publisher = {mathdoc}, volume = {24}, number = {1}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1988_24_1_a20/} }
M. M. Zainulabidov. The Tricomi problem when the line of change of type of the equation is closed. Differencialʹnye uravneniâ, Tome 24 (1988) no. 1, pp. 177-178. http://geodesic.mathdoc.fr/item/DE_1988_24_1_a20/