@article{IVM_2009_11_a9,
     author = {V. V. Cherkasova},
     title = {Connectivities induced by the rolling of a~ball on a~surface},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {79--84},
     publisher = {mathdoc},
     number = {11},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2009_11_a9/}
}