@article{1077378792, author = {Rudin, Walter}, title = {An extension theorem for positive-definite functions}, journal = {Duke Math. J.}, volume = {37}, number = {1}, year = {1970}, pages = { 49-53}, language = {en}, url = {http://dml.mathdoc.fr/item/1077378792} }
Rudin, Walter. An extension theorem for positive-definite functions. Duke Math. J., Tome 37 (1970) no. 1, pp. 49-53. http://gdmltest.u-ga.fr/item/1077378792/