@article{MZM_1999_66_3_a10,
     author = {P. I. Topalov},
     title = {Tensor invariants of natural mechanical systems on compact surfaces and the corresponding integrals},
     journal = {Matemati\v{c}eskie zametki},
     pages = {417--430},
     publisher = {mathdoc},
     volume = {66},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_3_a10/}
}