Algebraic & Geometric Topology Volume 3, issue 1 (2003)

1	J L Dupont, Scissors congruences, group homology and characteristic classes, Nankai Tracts in Mathematics 1, World Scientific Publishing Co. (2001) MR1832859
2	G Leibon, The symmetries of hyperbolic volume, preprint (2002)
3	J Milnor, Hyperbolic geometry: the first 150 years, Bull. Amer. Math. Soc. $($N.S.$)$ 6 (1982) 9 MR634431
4	J Murakami, M Yano, On the volume of a hyperbolic and spherical tetrahedron, Comm. Anal. Geom. 13 (2005) 379 MR2154824
5	J Roberts, Classical $6j$–symbols and the tetrahedron, Geom. Topol. 3 (1999) 21 MR1673272
6	È B Vinberg, Volumes of non–Euclidean polyhedra, Uspekhi Mat. Nauk 48 (1993) 17 MR1239859