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

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:

[Orgmode] Re: org-exp-bibtex.el - add support to citing bibtex in both html and latex exports

-file, although I only cite 3 of them in the org-file, the generated html file will still include all the 1000 entries. How can I solve this problem? Is there any way I only need to set some variable or add some keywords in the org file? Thanks in advance! regards, Lingyu Ma