@article{ELMA_1965__20_140814,
     author = {J\"urg R\"atz},
     title = {Begr\"undung und {Charakterisierung} der reellen {Logarithmusfunktionen.}},
     journal = {Elemente der Mathematik},
     pages = {122--128},
     publisher = {mathdoc},
     volume = {20},
     year = {1965},
     zbl = {0136.12401},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1965__20_140814/}
}