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How can I change cite style? If I cite a book I get, for example, [KA40]. I would like to have something like [Ka40]. I'm using BibTeX, \usepackage[numbers,square]{natbib} and \bibliographystyle{alphadin}. Does it depend on the bibliography style?

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With the alphadin style uppercase will be used for initials and lowercase for the other letters of the names. Are you experiencing something different? If so, please add to your question a minimal working example illustrating the problem. – Gonzalo Medina Apr 7 '11 at 14:26
@Herbert you are right! I didnt realize that used allways the book with two authors. Sorry for dummy question. – sivy Apr 7 '11 at 14:55

I suppose that "KA40" is a ref to an entry with two authors, the reason why it is in uppercase

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