@article{1077493072, author = {Schoenberg, I. J.}, title = {Positive definite functions on spheres}, journal = {Duke Math. J.}, volume = {9}, number = {1}, year = {1942}, pages = { 96-108}, language = {en}, url = {http://dml.mathdoc.fr/item/1077493072} }
Schoenberg, I. J. Positive definite functions on spheres. Duke Math. J., Tome 9 (1942) no. 1, pp. 96-108. http://gdmltest.u-ga.fr/item/1077493072/