@article{JRAM_1987__379_152947,
     author = {J.M. Wills and P. Gritzmann and D. Wrase},
     title = {A new isometric inequality.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {22--30},
     publisher = {mathdoc},
     volume = {379},
     year = {1987},
     zbl = {0611.52009},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__379_152947/}
}