Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1987_23_1_a9, author = {M. G. Karatopraklieva}, title = {On the theory of equations of mixed type with discontinuous coefficients. {I}}, journal = {Differencialʹnye uravneni\^a}, pages = {85--102}, publisher = {mathdoc}, volume = {23}, number = {1}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1987_23_1_a9/} }
M. G. Karatopraklieva. On the theory of equations of mixed type with discontinuous coefficients. I. Differencialʹnye uravneniâ, Tome 23 (1987) no. 1, pp. 85-102. http://geodesic.mathdoc.fr/item/DE_1987_23_1_a9/