@article{JRAM_1972__256_151248,
     author = {F.W. Sch\"afke},
     title = {Der },
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {58--70},
     publisher = {mathdoc},
     volume = {256},
     year = {1972},
     zbl = {0241.28009},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1972__256_151248/}
}