@article{GDZPPN001165267, title = {Positive Operators and an Inertia Theorem.}, journal = {Numerische Mathematik}, volume = {7}, year = {1965}, pages = {11-17}, zbl = {0158.28003}, url = {http://dml.mathdoc.fr/item/GDZPPN001165267} }
SCHNEIDER, H. Positive Operators and an Inertia Theorem.. Numerische Mathematik, Tome 7 (1965) pp. 11-17. http://gdmltest.u-ga.fr/item/GDZPPN001165267/