@article{MZ_1974__140_172139,
     author = {Frieder Lewerenz},
     title = {Nichtlineare analytische {Eigenwertprobleme} im {Banachraum.}},
     journal = {Mathematische Zeitschrift},
     pages = {151--172},
     publisher = {mathdoc},
     volume = {140},
     year = {1974},
     zbl = {0287.47044},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__140_172139/}
}