@article{CMUC_1973_14_1_a10,
     author = {Petry, Walter},
     title = {Nonlinear eigenvalue problems},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {113--126},
     year = {1973},
     volume = {14},
     number = {1},
     mrnumber = {0320831},
     zbl = {0255.35041},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1973_14_1_a10/}
}