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hi gmedina,

thanks for your help ... the manual only refers to writing the bibliography "by hand", do you think I HAVE to copy my bibliography from the *.bib file and put the text in the beamer file as indicated by the manual for the header to work?

the code I posted works fine it is just that I ...

I understand that by including a frame in my Beamer presentation with the "bibliography" command, a slide whose heading should be "References" will be created. Namely that:
\begin{frame}[allowframebreaks]{Bibliography}
\def\newblock{}
\bibliography{mybibfile}
\end{frame}
should create a slide ...