TY  - JOUR
AU  - Christov, Ognyan
AU  - Dragnev, Dragomir
TI  - Perturbations of Systems Describing the Motion of a Particle in Central Fields
JO  - Serdica Mathematical Journal
PY  - 1995
SP  - 91
EP  - 108
VL  - 21
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SMJ2_1995_21_2_a0/
LA  - en
ID  - SMJ2_1995_21_2_a0
ER  -