I am looking for the original reference for Ostrowski's theorem of 1916 that the only valuations on the rational numbers are the trivial, Archimedean, and p-adic valuations.

`http://en.wikipedia.org/wiki/Ostrowski's_theorem`

Wikipedia refers to Koblitz (p-adic Numbers, p-adic Analysis, and Zeta-Functions), but I can't find the reference in there.

Acta Math.paper is at the Wikipedia page, but with the wrong year (1918). – Barry Cipra May 23 '13 at 18:45