@article{GDZPPN00233514X, title = {The Perron-Frobenius theorem in relative spectral theory.}, journal = {Mathematische Annalen}, volume = {291}, year = {1991}, pages = {451-464}, zbl = {0712.47032}, url = {http://dml.mathdoc.fr/item/GDZPPN00233514X} }
Bidard, C.; Zerner, M. The Perron-Frobenius theorem in relative spectral theory.. Mathematische Annalen, Tome 291 (1991) pp. 451-464. http://gdmltest.u-ga.fr/item/GDZPPN00233514X/