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

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