@article{DAN_1963_151_6_a7,
     author = {G. Karatoprakliev},
     title = {On a generalization of the $T$-problem for the equation $u_{xx}+\operatorname{sign}yu_{yy}=0$},
     journal = {Doklady Akademii Nauk},
     pages = {1271--1273},
     publisher = {mathdoc},
     volume = {151},
     number = {6},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_6_a7/}
}