Yu. M. Krikunov, “The Tricomi problem for a certain special case of the equation <nobr>$K(y)u_{xx}+u_{yy}=0$</nobr>; II”, Trudy Sem. Kraev. Zadacham, 1968, Issue 5,Pages <nobr>122

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Trudy Sem. Kraev. Zadacham, 1968 Issue 5, Pages 122–136 (Mi kukz567)

The Tricomi problem for a certain special case of the equation $K(y)u_{xx}+u_{yy}=0$; II

Yu. M. Krikunov