@article{MZ_1971__120_171532,
     author = {G\"otz Alefeld and J\"urgen Herzberger},
     title = {Zur {Invertierung} linearer und beschr\"ankter {Operatoren.}},
     journal = {Mathematische Zeitschrift},
     pages = {309--317},
     publisher = {mathdoc},
     volume = {120},
     year = {1971},
     zbl = {0204.48003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__120_171532/}
}