References
F. Calogero:Variable Phase Approach to Potential Scattering (1967). See alsoF. Calogero:Scattering Theory: New Methods and Problems in Atomic, Nuclear and Particle Physics, Ed.A. D. Barut (London, 1970), pp. 3, 47.
J. Nuttall:The Padé Approximant in Theoretical Physics, Ed.G. A. Baker jr. andJ. L. Gammel (1970), p. 219.
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Singh, S.R. Equivalence of two variational methods in scattering theory. Lett. Nuovo Cimento 6, 482–484 (1973). https://doi.org/10.1007/BF02759064
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DOI: https://doi.org/10.1007/BF02759064