TY  - JOUR
AU  - G. Karatoprakliev
TI  - A modified $\mathrm{T}_1$ problem for the equation $u_{xx}+\operatorname{sign}yn u_{yy}=0$
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 23
EP  - 25
VL  - 150
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_150_1_a4/
LA  - ru
ID  - DAN_1963_150_1_a4
ER  -