@article{GDZPPN001166255, title = {Matrix Inequalities.}, journal = {Numerische Mathematik}, volume = {9}, year = {1966}, pages = {109-119}, zbl = {0148.25903}, url = {http://dml.mathdoc.fr/item/GDZPPN001166255} }
FIEDLER, M. Matrix Inequalities.. Numerische Mathematik, Tome 9 (1966) pp. 109-119. http://gdmltest.u-ga.fr/item/GDZPPN001166255/