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- [4] UNIQUENESS OF SOLUTIONS TO BOUNDARY-VALUE PROBLEMS FOR HYPERBOLIC EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (07): : A611 - A612
- [5] EXISTENCE AND UNIQUENESS OF SOLUTIONS TO CERTAIN BOUNDARY VALUE PROBLEMS FOR DEGENERATING ELLIPTIC SECOND-ORDER EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1965, 163 (01): : 22 - &