The TeX FAQ

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Bibliographies

Accents in bibliographies

BibTeX not only has a tendency (by default) to mess about with the case of letters in your bibliography, also makes a hash of accent commands: ma\~nana comes out as “ma nana” (!). The solution is similar that of the letter case problem: enclose the troublesome sequence in braces, as {\~n}, in this example.

FAQ ID: Q-bibaccent