@article{MAN_1959__137_160694,
     author = {C.L. Siegel},
     title = {Zur {Bestimmung} des {Volumens} des {Fundamentalbereichs} der unimodularen {Gruppe.}},
     journal = {Mathematische Annalen},
     pages = {427--432},
     publisher = {mathdoc},
     volume = {137},
     year = {1959},
     zbl = {0091.02902},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__137_160694/}
}