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- [23] RELATIONSHIP BETWEEN VARIATIONAL METHODS IN SCATTERING THEORY LETTERE AL NUOVO CIMENTO, 1973, 7 (12): : 493 - 497
- [24] PROJECTION AND VARIATIONAL METHODS IN KINETIC-THEORY QUARTERLY JOURNAL OF MECHANICS AND APPLIED MATHEMATICS, 1979, 32 (AUG): : 233 - 251
- [25] UNIFIED FORMULATION OF VARIATIONAL METHODS IN SCATTERING THEORY NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-GENERAL PHYSICS RELATIVITY ASTRONOMY AND MATHEMATICAL PHYSICS AND METHODS, 1974, B 22 (01): : 139 - 152