@article{MZM_2006_80_3_a5,
     author = {V. P. Grishukhin},
     title = {Free and {Nonfree} {Voronoi} {Polyhedra}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {367--378},
     publisher = {mathdoc},
     volume = {80},
     number = {3},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_3_a5/}
}