@article{1178245059,
author = {Umegaki, Hisaharu},
title = {Positive definite function and direct product Hilbert space},
journal = {Tohoku Math. J. (2)},
volume = {7},
number = {3},
year = {1955},
pages = { 206-211},
language = {en},
url = {http://dml.mathdoc.fr/item/1178245059}
}
Umegaki, Hisaharu. Positive definite function and direct product Hilbert space. Tohoku Math. J. (2), Tome 7 (1955) no. 3, pp. 206-211. http://gdmltest.u-ga.fr/item/1178245059/