@article{MAN_1972__197_162285,
     author = {Frank Deutsch and Robert J. Lindahl},
     title = {Minimal {Extremal} {Subsets} of the {Unit} {Sphere.}},
     journal = {Mathematische Annalen},
     pages = {251--278},
     publisher = {mathdoc},
     volume = {197},
     year = {1972},
     zbl = {0223.46020},
     url = {http://geodesic.mathdoc.fr/item/MAN_1972__197_162285/}
}