On problems of Bicadze--Samarski{\v\i} type for the equation $U_{xx}+\operatorname{sgn}y|y|^mU_{yy}=0$ ($0$)
Differencialʹnye uravneniâ, Tome 17 (1981) no. 6, pp. 1078-1089.

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@article{DE_1981_17_6_a12,
     author = {G. A. Ivashkina},
     title = {On problems of {Bicadze--Samarski{\v\i}} type for the equation $U_{xx}+\operatorname{sgn}y|y|^mU_{yy}=0$ ($0<m<1$)},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1078--1089},
     publisher = {mathdoc},
     volume = {17},
     number = {6},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_6_a12/}
}
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G. A. Ivashkina. On problems of Bicadze--Samarski{\v\i} type for the equation $U_{xx}+\operatorname{sgn}y|y|^mU_{yy}=0$ ($0