%0 Journal Article
%A R. Kh. Sabirov
%T Convolution of the secular equation of perturbation theory for a~degenerate case
%J Teoretičeskaâ i matematičeskaâ fizika
%D 1987
%P 79-84
%V 73
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TMF_1987_73_1_a7/
%G ru
%F TMF_1987_73_1_a7