@article{CMFD_2013_49_a1,
     author = {V. A. Krasnov},
     title = {On integral expressions for volumes of hyperbolic tetrahedra},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {89--98},
     publisher = {mathdoc},
     volume = {49},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2013_49_a1/}
}