@article{CM_1964__16__169_0,
     author = {Schoenberg, I. J.},
     title = {Arithmetic problems concerning {Cauchy's} functional equation},
     journal = {Compositio Mathematica},
     pages = {169--175},
     publisher = {Kraus Reprint},
     volume = {16},
     year = {1964},
     mrnumber = {173107},
     zbl = {0199.47901},
     language = {en},
     url = {http://www.numdam.org/item/CM_1964__16__169_0/}
}