@article{NUMA_1976__26_132398,
     author = {H. Linden},
     title = {Obere {Schranken} f\"ur {Eigenwerte} von {Eigenwertaufgaben} der {Form} (...2 {I}  {\^A?...A} {\^A?} {B)} x = 0 .  - {Upper} {Bounds} for {Eigenvalues} of {Quadratic} {Eigenvalue} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {17--26},
     publisher = {mathdoc},
     volume = {26},
     year = {1976},
     zbl = {0322.65031},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1976__26_132398/}
}