%0 Journal Article
%A M. A. Braun
%T Perturbation theory for level shifts and transition probabilities in a~relativistic two-electron system
%J Teoretičeskaâ i matematičeskaâ fizika
%D 1978
%P 59-68
%V 34
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TMF_1978_34_1_a5/
%G ru
%F TMF_1978_34_1_a5