[R] Sweave, Bibtex, package references

[Paolo Sonego]

Dear all,
I'm a big fan and happy user of the Sweave package for routine reporting.
 From inside a .Rnw script, I'd like to produce the references in bibtex 
format for each package loaded in the environment, write them in a .bib 
file  and load them back from the
\bibliography{bibliography} statement.
Is this feasible?
Any help would be greatly appreciated!
Thanks in advance,
Paolo