@article{AA_2002_14_5_a7,
     author = {G. Yu. Panina},
     title = {Virtual polytopes and classical questions of geometry},
     journal = {Algebra i analiz},
     pages = {152--170},
     year = {2002},
     volume = {14},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2002_14_5_a7/}
}