@article{1102991719,
author = {Ballantine, C. S.},
title = {Products of positive definite matrices. I.},
journal = {Pacific J. Math.},
volume = {23},
number = {3},
year = {1967},
pages = { 427-433},
language = {en},
url = {http://dml.mathdoc.fr/item/1102991719}
}
Ballantine, C. S. Products of positive definite matrices. I.. Pacific J. Math., Tome 23 (1967) no. 3, pp. 427-433. http://gdmltest.u-ga.fr/item/1102991719/