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.



Reference for Ostrowski's 1916 Theorem?
Barry Cipra is right. See <http://link.springer.com/article/10.1007/BF02422947>
I've changed the wikipedia's entry.


