@article{RM_2005_60_2_a6,
     author = {D. A. Derevnin and A. D. Mednykh},
     title = {A~formula for the volume of~a~hyperbolic tetrahedon},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {346--348},
     publisher = {mathdoc},
     volume = {60},
     number = {2},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2005_60_2_a6/}
}