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@article{DE_1989_25_1_a6, author = {N. Yu. Kapustin}, title = {$L_2$-solvability of boundary value problems for equations of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {50--59}, publisher = {mathdoc}, volume = {25}, number = {1}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1989_25_1_a6/} }
N. Yu. Kapustin. $L_2$-solvability of boundary value problems for equations of mixed type. Differencialʹnye uravneniâ, Tome 25 (1989) no. 1, pp. 50-59. http://geodesic.mathdoc.fr/item/DE_1989_25_1_a6/