@article{JRAM_1997__488_153924,
     author = {John G. Ratcliffe and Steven T. Tschantz},
     title = {Volumes of integral congruence hyperbolic manifolds.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {55--78},
     publisher = {mathdoc},
     volume = {488},
     year = {1997},
     zbl = {0873.11031},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1997__488_153924/}
}