TY  - JOUR
AU  - O. E. Orel
TI  - Rotation function for integrable problems reducing to the Abel equations. Orbital classification of Goryachev–Chaplygin systems.
JO  - Sbornik. Mathematics
PY  - 1995
SP  - 271
EP  - 296
VL  - 186
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/SM_1995_186_2_a6/
LA  - en
ID  - SM_1995_186_2_a6
ER  -