@article{01508303, title = {The volume spectrum of hyperbolic 4-manifolds.}, journal = {Experimental Mathematics}, volume = {9}, year = {2000}, pages = {101-125}, doi = {10.1080/10586458.2000.10504640}, zbl = {0963.57012}, language = {en}, url = {http://dml.mathdoc.fr/item/01508303} }
Ratcliffe, John G.; Tschantz, Steven T. The volume spectrum of hyperbolic 4-manifolds.. Experimental Mathematics, Tome 9 (2000) pp. 101-125. doi : 10.1080/10586458.2000.10504640. http://gdmltest.u-ga.fr/item/01508303/