Bibliography with article, book and onlinebibitem symbols

[julia.j...@arcor.de]

Hello everybody out there using Beamer,

Sorry for having already cross-posted to the comp.text.tex Usegroup, but I didn't know that beamer has a mailing list of its own.
My problem is actually simple to describe, but I'm having a hard time to solve it:
I have a bibliography with all kinds of bibitems such as books, articles and online resources. Beamer has beautiful symbols for all three of them, but only the first command of \setbeamertemplate{bibliography item}[article} is accepted:
\bibliographystyle{foo}
\bibliography{references}
\setbeamertemplate{bibliography item}[article]
\nocite{Article}
\setbeamertemplate{bibliography item}[default]
\nocite{Book}
Wouldn't it be nice to have a bibliographies, where all three different symbols can be used.

Thanks in advance for your answers,
Julia