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I am not sure why my TeXworks is not creating a bbl file. This happens after I started using a new computer, i. e. after installing MiKTeX (I have Windows 7). The error messages are like: 

Package natbib Warning: Citation `....' on page 1 undefined on input line 31

If I copy my old bbl file (from my old computer) in the current folder it works OK, but I need to update this bbl file.

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Do you have a .bib file in the same folder? TeXWorks will use this file to generate a new .bbl file. The \cite{...} commands in the TeX file actually refer to entries in the bib file. – Mark S. Everitt Dec 18 '11 at 12:06
yes, I do have that (.bib) file in the same folder. – shambhu Dec 18 '11 at 12:13
And you run BibTeX after pdfLaTeX? – Torbjørn T. Dec 18 '11 at 12:14
I only run Latex but I thought the latex document can call for the bibTex by a line i have: \bibliography{bibfilename}. so, this is not effectively running the bib file? at least my recall is that it used to work in my previous computer, please suggest – shambhu Dec 18 '11 at 17:18
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There are ways of having BibTeX run automatically, if necessary. IIRC there was at least a choice among the compilers in MikTeXs TeXworks called "pdflatex + MakeIndex + BibTeX". This runs a script that checks if there are undefined citations/references, and runs pdflatex and BibTeX as necessary. Perhaps you were using this before. Latexmk is another such script that is used for this purpose. – Torbjørn T. Dec 18 '11 at 20:30
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closed as too localized by Joseph Wright♦ Dec 18 '11 at 20:21

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