@article{DE_1968_4_1_a10,
     author = {I. M. Petrushko},
     title = {The {Fredholmicity} of certain boundary value problems for the equation $u_{xx}+yu_{yy}+\alpha(x,y)u_y+\beta(x,y)u_x+\gamma(x,y)u=f(x,y)$ in a mixed domain},
     journal = {Differencialʹnye uravneni\^a},
     pages = {123--135},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_1_a10/}
}