@article{JRAM_1976__288_151811,
     author = {Hiroshi Gunji and Donald L. McQuillan},
     title = {An analogue of class-number in higher dimensions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {183--191},
     publisher = {mathdoc},
     volume = {288},
     year = {1976},
     zbl = {0335.12020},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__288_151811/}
}