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Theory of boundary-value problems for mixed equations in multidimensional regions. I. (English) Zbl 0403.35077
MSC:
35M99 Partial differential equations of mixed type and mixed-type systems of partial differential equations
35G15 Boundary value problems for linear higher-order PDEs
35B45 A priori estimates in context of PDEs
35D10 Regularity of generalized solutions of PDE (MSC2000)
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