@article{MZ_1980__172_172942,
     author = {Hans Arwed Keller},
     title = {Ein nicht-klassischer {Hilbertscher} {Raum.}},
     journal = {Mathematische Zeitschrift},
     pages = {41--50},
     publisher = {mathdoc},
     volume = {172},
     year = {1980},
     zbl = {0414.46018},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__172_172942/}
}