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When I use \cite{ref1, ref2}, I have a character "?" which appears for ref2 instead of the number of the reference. Do you know how can I cite multiple references using \cite{ref1, ref2} ?

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This should work out of the box. Can you provide a [ meta.tex.stackexchange.com/questions/228/… ](MWE) that shows the problem? – Spike Jul 10 '12 at 12:26
ref2 is an unknown key and not in the bibfile . Maybe a typo ... – Herbert Jul 10 '12 at 12:27
Be sure to run bibtex and (pdf)latex again. – JLDiaz Jul 10 '12 at 17:58

I know this is an old question, but I have found that some bibliographic styles will not allow a space between the comma and bib key so instead of \cite{ref1, ref2} you may need to try \cite{ref1,ref2}.

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