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- [1] HYPERBOLIC EQUATIONS WITH PSEUDODIFFERENTIAL BOUNDARY-CONDITIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (01): : A148 - A148
- [3] WELL-POSEDNESS OF HYPERBOLIC-EQUATIONS WITH DELAY IN THE BOUNDARY-CONDITIONS SEMIGROUP THEORY AND APPLICATIONS, 1989, 116 : 215 - 230