Geodesic
A new example of hyperbolic virtual polytope
Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 11, Tome 372 (2009), pp. 19-33

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A new example of hyperbolic virtual polytope with four horns is constructed. The corresponding smooth hyperbolic hedgehog is not isotopic to the familiar example by Y. Martinez-Maure since the two hedgehogs generate nonisotopic configurations of great semi-circles on the two-sphere. Certain extrinsic-geometric properties of the polytope are established. Bibl. – 11 titles. 
@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/}
}
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M. G. Knyazeva. A new example of hyperbolic virtual polytope. Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 11, Tome 372 (2009), pp. 19-33. http://geodesic.mathdoc.fr/item/ZNSL_2009_372_a1/