Since it is back-end dependent, why don't you use:

#+latex: \bibliography{...}\bibilographystyle{...}

instead?

To avoid duplication.

Org-bibtex/reftex need the line:

#+bibliography: foo plain

You need to set `ad-return-value' somewhere, don't you?

:-) This is what I was looking for.

Thanks a lot!

Fabrice