@article{NUMA_1972__19_132141,
     author = {R.B. Kellogg},
     title = {On {Complex} {Eigenvalues} of {M} and {P} {Matrices.}},
     journal = {Numerische Mathematik},
     pages = {170--175},
     publisher = {mathdoc},
     volume = {19},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1972__19_132141/}
}