Voir la notice de l'article provenant de la source Heldermann Verlag
@article{JLT_1991_1_2_a11, author = {J. Friedrich}, title = {Extension of {Positive} {Definite} {Functions} on {Lie} {Groups}}, journal = {Journal of Lie theory}, pages = {225--234}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1991}, url = {http://geodesic.mathdoc.fr/item/JLT_1991_1_2_a11/} }
J. Friedrich. Extension of Positive Definite Functions on Lie Groups. Journal of Lie theory, Tome 1 (1991) no. 2, pp. 225-234. http://geodesic.mathdoc.fr/item/JLT_1991_1_2_a11/