Geodesic
Perturbation theory for resonance and virtual states
Teoretičeskaâ i matematičeskaâ fizika, Tome 12 (1972) no. 3, pp. 397-406

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On the basis of the Hilbert–Schmidt method a perturbation theory is developed that gives a uniform description of the corrections to the energies of bound, virtual, and resonance states . The corrections to the phase shifts are found. A short-range and the Coulomb potential are considered as perturbations. 
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     author = {S. I. Manaenkov},
     title = {Perturbation theory for resonance and virtual states},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {397--406},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_12_3_a7/}
}
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S. I. Manaenkov. Perturbation theory for resonance and virtual states. Teoretičeskaâ i matematičeskaâ fizika, Tome 12 (1972) no. 3, pp. 397-406. http://geodesic.mathdoc.fr/item/TMF_1972_12_3_a7/