@article{CMUC_1974_15_3_a5,
     author = {Petry, Walter},
     title = {Nonlinear operator equations and boundary-value problems},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {451--463},
     year = {1974},
     volume = {15},
     number = {3},
     mrnumber = {0375024},
     zbl = {0289.47033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1974_15_3_a5/}
}