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@article{JRAM_1967__227_150808, author = {N. Nobusawa}, title = {On class numbers of lattices in isotropic spaces.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {209--211}, publisher = {mathdoc}, volume = {227}, year = {1967}, zbl = {0204.07404}, url = {http://geodesic.mathdoc.fr/item/JRAM_1967__227_150808/} }
N. Nobusawa. On class numbers of lattices in isotropic spaces.. Journal für die reine und angewandte Mathematik, Tome 227 (1967), pp. 209-211. http://geodesic.mathdoc.fr/item/JRAM_1967__227_150808/