@article{MAIS_2013_20_6_a13,
     author = {I. Kh. Sabitov},
     title = {Hyperbolic {Tetrahedron:} {Volume} {Calculation} with {Application} to the {Proof} of the {Schl\"afli} {Formula}},
     journal = {Modelirovanie i analiz informacionnyh sistem},
     pages = {149--161},
     publisher = {mathdoc},
     volume = {20},
     number = {6},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAIS_2013_20_6_a13/}
}