@article{GDZPPN002298430, title = {Diameter, Perimeter, and Girth of Spheres}, journal = {Mathematische Annalen}, volume = {174}, year = {1967}, pages = {59-82}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN002298430} }
Schäfer, Juan Jorge. Diameter, Perimeter, and Girth of Spheres. Mathematische Annalen, Tome 174 (1967) pp. 59-82. http://gdmltest.u-ga.fr/item/GDZPPN002298430/