@article{DE_1976_12_1_a9,
     author = {S. K. Kumykova},
     title = {A certain boundary value problem with shift for the equation $\operatorname{sign}y|y|^mu_{xx}+y_{yy}=0$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {79--88},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_1_a9/}
}