1. Perturbation Theory of Linear Operators;Kato,1966
2. Methods of Modern Mathematical Physics;Reed,1972
3. Nonhomogeneous media and vibration theory;Sanchez-Palencia,1980
4. Nonlinear operators and nonlinear equations of evolution;Browder,1976
5. Opérateurs maximaux monotones et semi groupes de contractions dans les espaces de Hilbert;Brezis,1973