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- [2] DIFFERENCE APPROXIMATIONS FOR INITIAL BOUNDARY-VALUE PROBLEMS PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1971, 323 (1553): : 255 - &
- [9] UNIQUENESS OF SOLUTIONS TO BOUNDARY-VALUE PROBLEMS FOR HYPERBOLIC EQUATIONS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (07): : A611 - A612