I would appreciate if someone could help me finding an English, Spanish, or Italian translation of the original papers by Perron and Frobenius on positive and non-negative matrices:
Perron, Oskar (1907), "Zur Theorie der Matrices", Mathematische Annalen, 64 (2): 248–263
Frobenius, Georg (1912), "Ueber Matrizen aus nicht negativen Elementen", Sitzungsber. Königl. Preuss. Akad. Wiss.: 456–477