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- [26] THE DIRICHLET PROBLEM FOR THE WAVE EQUATION DOKLADY AKADEMII NAUK SSSR, 1959, 127 (03): : 501 - 504
- [27] THE TRICOMI PROBLEM FOR THE GENERAL EQUATION OF LAVRENTIEV-BITZADZE DOKLADY AKADEMII NAUK SSSR, 1958, 118 (01): : 38 - 41