@article{NUMA_1974__22_132267,
     author = {W.R. Richert},
     title = {Zur  {Fehlerabsch\"atzung}  f\"ur  {Eigenwertaufgaben}  vom  {Typ} {(...2I} - {...A-B)x} = 0.},
     journal = {Numerische Mathematik},
     pages = {233--240},
     publisher = {mathdoc},
     volume = {22},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1974__22_132267/}
}