%0 Journal Article
%A Christov, Ognyan
%A Dragnev, Dragomir
%T Perturbations of Systems Describing the Motion of a Particle in Central Fields
%J Serdica Mathematical Journal
%D 1995
%P 91-108
%V 21
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SMJ2_1995_21_2_a0/
%G en
%F SMJ2_1995_21_2_a0