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- [27] BOUNDARY OBSERVABILITY OF THE WAVE-EQUATION COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE, 1986, 302 (12): : 443 - 446
- [30] GENERALIZED COVARIANT 2-BODY WAVE-EQUATION MODERN PHYSICS LETTERS A, 1993, 8 (37) : 3537 - 3545