Yu. M. Krikunov, “A boundary value problem for the equation <nobr>$u_{xx}+\operatorname{sgn}(xy)u_{yy}=0$</nobr>”, Trudy Sem. Kraev. Zadacham, 1974, Issue 11,Pages <nobr>100

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Trudy Sem. Kraev. Zadacham, 1974 Issue 11, Pages 100–106 (Mi kukz402)

A boundary value problem for the equation $u_{xx}+\operatorname{sgn}(xy)u_{yy}=0$

Yu. M. Krikunov

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