@article{DE_1973_9_1_a15,
     author = {M. S. Salakhitdinov and A. Tolipov},
     title = {Certain boundary value problems for a certain class of equations of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {142--148},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_1_a15/}
}