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by john_s
Sun Dec 19, 2010 4:32 pm
Forum: BibTeX, biblatex and biber
Topic: natbib undefined citations
Replies: 12
Views: 170657

Re: natbib undefined citations

I've been having similar problems with natbib. There was an obscure message at the end of the undefined citations suggesting that there was an inappropriate ampersand (&) in the .bbl file.

Turned out that some citations retrieved from Medline put a URL field into the .bib file, and these contain ...