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- [1] EQUIVALENCE OF 2 VARIATIONAL METHODS IN SCATTERING THEORY LETTERE AL NUOVO CIMENTO, 1973, 6 (12): : 482 - 484
- [3] EQUIVALENCE OF RUBINOW AND SECOND HULTHEN VARIATIONAL METHODS PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON, 1967, 91 (574P): : 807 - &