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- [4] STABILITY QUESTIONS FOR BOUNDARY-VALUE PROBLEMS ANNALES DE LA SOCIETE SCIENTIFIQUE DE BRUXELLES SERIES 1-SCIENCES MATHEMATIQUES ASTRONOMIQUES ET PHYSIQUES, 1978, 92 (03): : 109 - 126
- [7] 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] COERCIVE BOUNDARY-VALUE PROBLEMS FOR DIFFERENCE OPERATORS DOKLADY AKADEMII NAUK SSSR, 1970, 192 (01): : 42 - &