Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1970__190_162105, author = {J.J. Sch\"affer}, title = {Spheres with {Maximum} {Inner} {Diameter.}}, journal = {Mathematische Annalen}, pages = {242--247}, publisher = {mathdoc}, volume = {190}, year = {1970}, zbl = {0197.18603}, url = {http://geodesic.mathdoc.fr/item/MAN_1970__190_162105/} }
J.J. Schäffer. Spheres with Maximum Inner Diameter.. Mathematische Annalen, Tome 190 (1970), pp. 242-247. http://geodesic.mathdoc.fr/item/MAN_1970__190_162105/