BibTeX, biblatex and biber ⇒ beamer | No Bibliography Reference

[esc]

Hi!
I'm creating a presentation with beamer and I've got a problem. I use these commands to generate my bibliography:

Code: Select all

\section{Bibliography}
\begin{frame}
\begin{thebibliography}{99}
\addcontentsline{toc}{chapter}{\numberline{}Bibliography}
\bibliographystyle{alpha}

\bibitem[Boulakia09]{Boul09} M. Boulakia, S. Cazeau, M. A. Fern\'andez, J.-F. Gerbeau, N. Zenzemi.
\emph{Mathematical Modeling of Electrocardiograms: A Numerical Study}. Annals of Biomedical Engineering, 2009.
\end{thebibliography}
\end{frame}

(I have few videos, and they have a conflict with the hyperlink, so I prefer to not use the .bib that doesn't work)

When I cite an article

Code: Select all

\cite{Boul09}

the reference appears correct (in my pdf I have "[Boulakia09]") but in the bibliography slide I have only triangles near the articles descriptions. I also used the .bib but results don't change! I still have triangle, even changing the bibliography style.

What do I have to do to obtain the "[Boulakia09]" also in the bibliography slide?

Thank you.