@article{ELMA_1981__36_141264,
     author = {J\"urgen R\"atz},
     title = {Zur {Charakterisierung} des {Skalarprduktes.}},
     journal = {Elemente der Mathematik},
     pages = {94--96},
     publisher = {mathdoc},
     volume = {36},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1981__36_141264/}
}