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Thanks for the suggestion... in doing so I managed to locate the problem -- one of my colleagues had redefined \cite in the preamble! It's all fixed now, thanks for your help.

Hi all,

I'm trying to use the optional argument in \cite to reference a specific theorem within a book. I get the following error message when running BiBTeX:

Warning--I didn't find a database entry for "["

and this is the pdf output I get after continuing regardless and compiling the LaTeX ...