@article{MZ_1975__141_172160,
     author = {Eliahu Zini},
     title = {\`A propos de quelque op\'erateurs non lin\'earies.},
     journal = {Mathematische Zeitschrift},
     pages = {111--138},
     year = {1975},
     volume = {141},
     zbl = {0282.47017},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__141_172160/}
}