@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/}
}