@article{GDZPPN00220472X, title = {A new isometric inequality.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, volume = {374}, year = {1987}, pages = {22-30}, zbl = {0611.52009}, url = {http://dml.mathdoc.fr/item/GDZPPN00220472X} }
Wills, J.M.; Gritzmann, P.; Wrase, D. A new isometric inequality.. Journal für die reine und angewandte Mathematik, Tome 374 (1987) pp. 22-30. http://gdmltest.u-ga.fr/item/GDZPPN00220472X/