@article{MZ_1950__52_169144,
     author = {H. Wielandt},
     title = {Unzerlegbare, nicht negative {Matrizen}},
     journal = {Mathematische Zeitschrift},
     pages = {642--648},
     publisher = {mathdoc},
     volume = {52},
     year = {1950},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1950__52_169144/}
}