TY - JOUR AU - P. I. Topalov TI - Tensor invariants of natural mechanical systems on compact surfaces and the corresponding integrals JO - Matematičeskie zametki PY - 1999 SP - 417 EP - 430 VL - 66 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1999_66_3_a10/ LA - ru ID - MZM_1999_66_3_a10 ER -