Yu. M. Krikunov, “A particular case of the equation <nobr>$K(y)u_{xx}+\operatorname{sgn}(xy)K(x)u_{yy}=0$</nobr>”, Trudy Sem. Kraev. Zadacham, 1975, Issue 12,Pages <nobr>126

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Trudy Sem. Kraev. Zadacham, 1975 Issue 12, Pages 126–133 (Mi kukz379)

A particular case of the equation $K(y)u_{xx}+\operatorname{sgn}(xy)K(x)u_{yy}=0$

Yu. M. Krikunov

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