@article{JRAM_1976__0286_0287_151786,
     author = {Gerd Hofmeister and Norbert H\"ammerer},
     title = {Zu einer {Vermutung} von {Rohrbach.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {239--247},
     publisher = {mathdoc},
     volume = {0286_0287},
     year = {1976},
     zbl = {0332.10032},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__0286_0287_151786/}
}