@article{MZ_1942__48_168987,
     author = {L. Collatz},
     title = {Einschlie{\ss}ungssatz f\"ur die charakteristischen {Zahlen} von {Matrizen}},
     journal = {Mathematische Zeitschrift},
     pages = {221--226},
     publisher = {mathdoc},
     volume = {48},
     year = {1942},
     zbl = {68.0031.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1942__48_168987/}
}