@article{DAN_1976_227_3_a10,
     author = {L. M. Nevostruev and S. P. Pul'kin},
     title = {Some boundary value problems for an equation with two lines of degeneracy},
     journal = {Doklady Akademii Nauk},
     pages = {558--561},
     publisher = {mathdoc},
     volume = {227},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_227_3_a10/}
}