@article{ZNSL_2009_372_a1,
     author = {M. G. Knyazeva},
     title = {A new example of hyperbolic virtual polytope},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {19--33},
     publisher = {mathdoc},
     volume = {372},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2009_372_a1/}
}