Usind rst2latex, which command allows me to include a citation key, that references a bibtex database? In latex I would have achieved this with \cite{Rumpelstielzchen2003}
There is a very handy tool called bib2reSTcitation to convert bibtex style references file to reStructuredText Markup style citation style.
just run:
$ python bib2reSTcitation.py -i tex.bib -o references.txt
And you get what you want. Hope it helps!