Geodesic
Perturbation theory for a degenerate level
Teoretičeskaâ i matematičeskaâ fizika, Tome 41 (1979) no. 2, pp. 285-288 Cet article a éte moissonné depuis la source Math-Net.Ru

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A simple analytic method is proposed for the summation of the time divergences of the expansion for the shift of an unperturbed degeneratelevel; the method is based on residue theory. 
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     author = {M. F. Sarry},
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M. F. Sarry. Perturbation theory for a degenerate level. Teoretičeskaâ i matematičeskaâ fizika, Tome 41 (1979) no. 2, pp. 285-288. http://geodesic.mathdoc.fr/item/TMF_1979_41_2_a10/

[1] D. Taules, Kvantovaya mekhanika sistem mnogikh chastits, IL, 1963, str. 63 | MR

[2] M. F. Sarry, TMF, 31 (1977), 365 | MR

[3] A. N. Vasilev, A. L. Kitanin, TMF, 24 (1975), 219 | MR | Zbl

[4] A. L. Kitanin, TMF, 25 (1975), 414 | MR | Zbl