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@article{NUMA_1966__9_131736, author = {M. FIEDLER and V. PT\'AK}, title = {Some {Generalizations} of {Positive} {Definiteness} and {Monotonicity.}}, journal = {Numerische Mathematik}, pages = {163--172}, publisher = {mathdoc}, volume = {9}, year = {1966}, zbl = {0148.25801}, url = {http://geodesic.mathdoc.fr/item/NUMA_1966__9_131736/} }
M. FIEDLER; V. PTÁK. Some Generalizations of Positive Definiteness and Monotonicity.. Numerische Mathematik, Tome 9 (1966), pp. 163-172. http://geodesic.mathdoc.fr/item/NUMA_1966__9_131736/