Geodesic
Calculation of scattering amplitudes near resonance
Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 2, pp. 267-272 
A. P. Kochkin. Calculation of scattering amplitudes near resonance. Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 2, pp. 267-272. http://geodesic.mathdoc.fr/item/TMF_1974_18_2_a12/
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     author = {A. P. Kochkin},
     title = {Calculation of scattering amplitudes near resonance},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {267--272},
     year = {1974},
     volume = {18},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_18_2_a12/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A method is proposed for directly calculating the coefficients in the principal term of the expansion of scattering amplitudes near resonance without knowledge of the phase shifts. In the anisotropic case it can also be used to calculate the dampings of levels that would be truly bound states if their energy did not lie within other bands.

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