@article{DE_1986_22_10_a9,
     author = {T. Sh. Kal'menov},
     title = {Regular selfadjoint boundary value problems for a multidimensional equation of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1745--1753},
     publisher = {mathdoc},
     volume = {22},
     number = {10},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_10_a9/}
}