Geodesic
Perturbation theory for level shifts and transition probabilities in a~relativistic two-electron system
Teoretičeskaâ i matematičeskaâ fizika, Tome 34 (1978) no. 1, pp. 59-68

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A variant of perturbation theory is constructed for calculating the level shifts and transition probabilities in a relativistic two-electron atom with allowance for renormalization of the mass and charge of the electrons and with the possibility of considering degenerate states. The corrections for retardation in the second order in $\alpha$ are analyzed. 
@article{TMF_1978_34_1_a5,
     author = {M. A. Braun},
     title = {Perturbation theory for level shifts and transition probabilities in a~relativistic two-electron system},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {59--68},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1978_34_1_a5/}
}
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M. A. Braun. Perturbation theory for level shifts and transition probabilities in a~relativistic two-electron system. Teoretičeskaâ i matematičeskaâ fizika, Tome 34 (1978) no. 1, pp. 59-68. http://geodesic.mathdoc.fr/item/TMF_1978_34_1_a5/