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I am trying to implement full citations in footnotes in Beamer as I found on the latex wikibooks https://en.wikibooks.org/wiki/LaTeX/Presentations, and the reference style found at bibliography in Beamer. I can't seem to make it work, am I missing something? Here is a MWE.

documentclass[10pt,handout,english]{beamer}

usepackage[english]{babel}

usepackage[backend=biber,style=numeric-comp,sorting=none]{biblatex}

addbibresource{bib2.bib}



setbeamertemplate{bibliography entry title}{}

setbeamertemplate{bibliography entry location}{}

setbeamertemplate{bibliography entry note}{}



begin{document}



begin{frame}



 frametitle{Title}

 A reference~footfullcite{Amin}, with ref_bib an item of the .bib file.



end{frame}



begin{frame}[allowframebreaks]

        frametitle{References}

        bibliographystyle{amsalpha}

        bibliography{bib2.bib}

end{frame}



end{document}

Because you load the biblatex package, you should replace bibliography{bib2.bib} by printbibliography and remove bibliographystyle{amsalpha}, the style is defined as optional argument during package loading, numeric-comp in your example. Please also note that you have to use biber instead of bibtex with the code your show.

In case you prefer a style imitating the amsalpha style, see Any amsalpha-like style in Biblatex?

documentclass[10pt,handout,english]{beamer}

usepackage[english]{babel}

usepackage[backend=biber,style=numeric-comp,sorting=none]{biblatex}





usepackage{filecontents}

begin{filecontents*}{bib2.bib}

@book{knuth,

  author       = {Knuth, Donald E.},

  title        = {The {TeX} book},

  date         = 1984,

  maintitle    = {Computers & Typesetting},

  volume       = {A},

  publisher    = {Addison-Wesley},

  location     = {Reading, Mass.},

  langid       = {english},

  langidopts   = {variant=american},

  sortyear     = {1984-1},

  sorttitle    = {Computers & Typesetting A},

  indexsorttitle= {The TeXbook},

  indextitle   = {protectTeX book, The},

  shorttitle   = {TeX book}

}



@article{einstein,

    author = {Einstein, A.},

    title = {Die Grundlage der allgemeinen Relativitätstheorie},

    journal = {Annalen der Physik},

    volume = {354},

    number = {7},

    doi = {10.1002/andp.19163540702},

    pages = {769--822},

    year = {1916}

}

end{filecontents*}



addbibresource{bib2.bib}



begin{document}



begin{frame}



 frametitle{Title}

 A referencefootfullcite{knuth}, with refbib an item of the .bib file.



end{frame}



begin{frame}[allowframebreaks]

        frametitle{References}

%        bibliographystyle{amsalpha}

printbibliography

%        bibliography{bib2.bib}

end{frame}



end{document}