@article{DE_1971_7_8_a9,
     author = {F. Sh. Baiguzin},
     title = {A certain boundary value for a fourth order equation of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1429--1439},
     year = {1971},
     volume = {7},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_8_a9/}
}