
doi: 10.1007/bf02308548
For the equation \(u_{xy} +A(x,y)u_x +B(x,y)u_y +C(x,y)u =f(x,y)\) in the domain \(D=\{(x,y): 0
auxiliary Goursat problem, First-order hyperbolic systems
auxiliary Goursat problem, First-order hyperbolic systems
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