@article{DE_1976_12_1_a11,
     author = {T. I. Lanina},
     title = {Smoothness of the solution of a certain boundary value problem for an equation of mixed type with two parallel lines of degeneracy},
     journal = {Differencialʹnye uravneni\^a},
     pages = {97--102},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_1_a11/}
}