%0 Journal Article
%A G. Karatoprakliev
%T A modified $\mathrm{T}_1$ problem for the equation $u_{xx}+\operatorname{sign}yn u_{yy}=0$
%J Doklady Akademii Nauk
%D 1963
%P 23-25
%V 150
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_150_1_a4/
%G ru
%F DAN_1963_150_1_a4