[Orgmode] Automatically select BibTex entries used in the org file

[Pony]

Hi all,

At present, if I include a *.bib which has 1000 entries in an org-file, 
although I only cite 3 of them in the org-file, the generated html file 
will still include all the 1000 entries.

There was an issue about "org-exp-bibtex.el" in this newsgroup, 
here is the address:
http://www.mail-archive.com/address@hidden/msg11723.html

In the issue, "Taru Karttunen" said it's possible and easy to add an option
to just select the entries that are used in the org-file.
However, I cannot find anything about how to accomplish that.

Does anyone know how to solve this problem?

Thanks in advance!