A modified $\mathrm{T}_1$ problem for the equation $u_{xx}+\operatorname{sign}yn u_{yy}=0$
Doklady Akademii Nauk, Tome 150 (1963) no. 1, pp. 23-25
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@article{DAN_1963_150_1_a4,
author = {G. Karatoprakliev},
title = {A modified $\mathrm{T}_1$ problem for the equation $u_{xx}+\operatorname{sign}yn u_{yy}=0$},
journal = {Doklady Akademii Nauk},
pages = {23--25},
year = {1963},
volume = {150},
number = {1},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1963_150_1_a4/}
}
G. Karatoprakliev. A modified $\mathrm{T}_1$ problem for the equation $u_{xx}+\operatorname{sign}yn u_{yy}=0$. Doklady Akademii Nauk, Tome 150 (1963) no. 1, pp. 23-25. http://geodesic.mathdoc.fr/item/DAN_1963_150_1_a4/