@article{IVM_2012_4_a9,
     author = {D. V. Khromov},
     title = {3D circular shapes and curve skeletons},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {90--99},
     publisher = {mathdoc},
     number = {4},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2012_4_a9/}
}