%0 Journal Article
%A A. L. Zubarev
%T Schwinger variational principle for bound states and scattering problems
%J Teoretičeskaâ i matematičeskaâ fizika
%D 1977
%P 73-81
%V 30
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a8/
%G ru
%F TMF_1977_30_1_a8