Geodesic
On integral expressions for volumes of hyperbolic tetrahedra
Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 49 (2013), pp. 89-98

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In this paper, we derive the Derevnin–Mednykh integral expression for the volume of a hyperbolic tetrahedron in terms of dihedral angles from the Murakami–Yano expression. As a consequence, we derive an expression for the volume of a hyperbolic tetrahedron in terms of edge lengths. 
@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/}
}
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V. A. Krasnov. On integral expressions for volumes of hyperbolic tetrahedra. Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 49 (2013), pp. 89-98. http://geodesic.mathdoc.fr/item/CMFD_2013_49_a1/