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- [2] PROPAGATION OF SINGULARITIES FOR BOUNDARY-VALUE-PROBLEMS DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1982, 35 (11): : 1459 - 1461
- [3] THE BOUNDARY-VALUE PROBLEMS OF WAVE-PROPAGATION IN INHOMOGENEOUS MOVING PLASMA ACTA GEOPHYSICA SINICA, 1985, 28 (01): : 7 - 14
- [5] THE THEORY OF NONLOCAL BOUNDARY-VALUE-PROBLEMS DOKLADY AKADEMII NAUK SSSR, 1984, 277 (01): : 17 - 19
- [8] BOUNDARY-VALUE-PROBLEMS FOR THE WAVE-EQUATION SOVIET PHYSICS ACOUSTICS-USSR, 1982, 28 (01): : 1 - 4