@article{AM2_1977__15_136659,
     author = {J. Sprekels},
     title = {Einige {Existenz-} und {Einschlie{\ss}ungss\"atze} f\"ur {Fixpunkte} expandierender {Integraloperatoren.} {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {304--305},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0369.47027},
     url = {http://geodesic.mathdoc.fr/item/AM2_1977__15_136659/}
}