@article{GDZPPN002306484, title = {Minimal Extremal Subsets of the Unit Sphere.}, journal = {Mathematische Annalen}, volume = {196}, year = {1972}, pages = {251-278}, zbl = {0223.46020}, url = {http://dml.mathdoc.fr/item/GDZPPN002306484} }
Deutsch, Frank; Lindahl, Robert J. Minimal Extremal Subsets of the Unit Sphere.. Mathematische Annalen, Tome 196 (1972) pp. 251-278. http://gdmltest.u-ga.fr/item/GDZPPN002306484/