@article{10_4064_ap_9_2_183_187,
     author = {J. Acz\'el and Stanis{\l}aw Go{\l}\k{a}b and M. Kuczma and E. Siwek},
     title = {Das {Doppelverh\"altnis} als {L\"osung} einer {Funktionalgleichung}},
     journal = {Annales Polonici Mathematici},
     pages = {183--187},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1960},
     doi = {10.4064/ap-9-2-183-187},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-9-2-183-187/}
}