@article{ND_2012_8_5_a6,
     author = {Alexey V. Borisov and Ivan S. Mamaev},
     title = {Topological analysis of one integrable system related to the rolling of a ball over a sphere},
     journal = {Russian journal of nonlinear dynamics},
     pages = {957--975},
     publisher = {mathdoc},
     volume = {8},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2012_8_5_a6/}
}