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- [2] THE CARLEMAN ESTIMATES AND INVERSE PROBLEMS FOR HYPERBOLIC-EQUATIONS DOKLADY AKADEMII NAUK SSSR, 1984, 279 (04): : 817 - 820
- [4] HIDDEN REGULARITY IN SOME NONLINEAR HYPERBOLIC-EQUATIONS MATEMATICA APLICADA E COMPUTACIONAL, 1987, 6 (01): : 7 - 15
- [5] OSCILLATION PROPERTIES FOR SOME DAMPED HYPERBOLIC-EQUATIONS HOUSTON JOURNAL OF MATHEMATICS, 1990, 16 (01): : 25 - 52