TY  - JOUR
AU  - M. A. Braun
TI  - Perturbation theory for level shifts and transition probabilities in a~relativistic two-electron system
JO  - Teoretičeskaâ i matematičeskaâ fizika
PY  - 1978
SP  - 59
EP  - 68
VL  - 34
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TMF_1978_34_1_a5/
LA  - ru
ID  - TMF_1978_34_1_a5
ER  -