@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/}
}