@article{NUMA_1964__6_131624,
     author = {P. LANCASTER},
     title = {On {Eigenvalues} of {Matrices} {Dependent} on a {Parameter.}},
     journal = {Numerische Mathematik},
     pages = {377--387},
     year = {1964},
     volume = {6},
     zbl = {0133.26201},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1964__6_131624/}
}