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@article{DE_1978_14_7_a20, author = {I. V. Maiorov}, title = {A problem for equations of mixed type with a closed line of degeneracy}, journal = {Differencialʹnye uravneni\^a}, pages = {1321--1323}, publisher = {mathdoc}, volume = {14}, number = {7}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1978_14_7_a20/} }
I. V. Maiorov. A problem for equations of mixed type with a closed line of degeneracy. Differencialʹnye uravneniâ, Tome 14 (1978) no. 7, pp. 1321-1323. http://geodesic.mathdoc.fr/item/DE_1978_14_7_a20/