@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/