# biblatex's \footfullcite typesets citation twice in beamer

Consider main.bib:

@techreport{2012FracfocusChemical,
author = {FracFocus,},
howpublished = {\url{http://fracfocus.org/water-protection/drilling-usage}},
institution = {The Ground Water Protection Council and Interstate Oil and Gas
Compact Commission},
month = {feb},
title = {{Chemical Use In Hydraulic Fracturing}},
year = {2012}
}


Consider mwe.tex:

\documentclass {beamer}

\usepackage [backend=biber,style=authoryear] {biblatex}

\newcommand{\currentpart}{}
\let\oldpart = \part
\renewcommand{\part}[1]{%
\oldpart{#1}
\renewcommand{\currentpart}{#1}
}

\newcommand{\currentsection}{}
\let\oldsection = \section
\renewcommand{\section}[1]{%
\oldsection{#1}
\renewcommand{\currentsection}{#1}
}

\begin{document}

\begin{frame}
\frametitle{\currentpart}
\framesubtitle{\currentsection}
\begin{block}{}
\begin{figure}
\begin{minipage}{4.5in}
\centering
\fbox{%
%       \includegraphics[scale=0.2]{../Pictures/active_research}
}
\caption{Conceptualization of the process of Carbon Capture, Utilization,
and Sequestration highlighting active research
areas\footfullcite{2012FracfocusChemical}.}
\label{fig:active_research}
\end{minipage}
\end{figure}
\end{block}
\end{frame}

\end{document}


Why does the \footfullcite instruction typesets double citation? I.e., this occurs:

Also:

C:\Users\ejspeiro>biber --version
biber version: 1.8

C:\Users\ejspeiro>pdflatex --version
MiKTeX-pdfTeX 2.9.4902 (1.40.14) (MiKTeX 2.9)
Copyright (C) 1982 D. E. Knuth, (C) 1996-2012 Han The Thanh
TeX is a trademark of the American Mathematical Society.


Do you really need footnotes in a presentation inside a caption?

The problem observed is a bad interaction with the moving argument from \caption You can prevent it by using \footnotemark and \footnotetext{\fullcite{<key>}}, but the marker will still need manual adjustment:

\documentclass {beamer}
\usepackage{filecontents}
\begin{filecontents*}{main.bib}
@techreport{2012FracfocusChemical,
author = {FracFocus,},
howpublished = {\url{http://fracfocus.org/water-protection/drilling-usage}},
institution = {The Ground Water Protection Council and Interstate Oil and Gas
Compact Commission},
month = {feb},
title = {{Chemical Use In Hydraulic Fracturing}},
year = {2012}
}
\end{filecontents*}

\usepackage [backend=biber,style=authoryear] {biblatex}

\newcommand{\currentpart}{}
\let\oldpart = \part
\renewcommand{\part}[1]{%
\oldpart{#1}
\renewcommand{\currentpart}{#1}
}

\newcommand{\currentsection}{}
\let\oldsection = \section
\renewcommand{\section}[1]{%
\oldsection{#1}
\renewcommand{\currentsection}{#1}
}

\begin{document}

\begin{frame}
\frametitle{\currentpart}
\framesubtitle{\currentsection}
\begin{block}{}
\begin{figure}
\begin{minipage}{4.5in}
\centering
\fbox{%
%       \includegraphics[scale=0.2]{../Pictures/active_research}
}
\caption{Conceptualization of the process of Carbon Capture, Utilization,
and Sequestration highlighting active research
areas\footnotemark[1].}
\label{fig:active_research}
\end{minipage}
\footnotetext[1]{\fullcite{2012FracfocusChemical}}
\end{figure}
\end{block}
\end{frame}

\end{document}


In comments it's been discussed that the intent is to cite the source for the image; in this case, I'd suggest to get rid of footnotes and add the source directly under the image's caption, using something like the following:

\documentclass {beamer}
\usepackage{filecontents}
\begin{filecontents*}{main.bib}
@techreport{2012FracfocusChemical,
author = {FracFocus,},
howpublished = {\url{http://fracfocus.org/water-protection/drilling-usage}},
institution = {The Ground Water Protection Council and Interstate Oil and Gas
Compact Commission},
month = {feb},
title = {{Chemical Use In Hydraulic Fracturing}},
year = {2012}
}
\end{filecontents*}

\usepackage [backend=biber,style=authoryear] {biblatex}

\newcommand{\currentpart}{}
\let\oldpart = \part
\renewcommand{\part}[1]{%
\oldpart{#1}
\renewcommand{\currentpart}{#1}
}

\newcommand{\currentsection}{}
\let\oldsection = \section
\renewcommand{\section}[1]{%
\oldsection{#1}
\renewcommand{\currentsection}{#1}
}

\begin{document}

\begin{frame}
\frametitle{\currentpart}
\framesubtitle{\currentsection}
\begin{block}{}
\begin{figure}
\begin{minipage}{4.5in}
\centering
\fbox{%
%       \includegraphics[scale=0.2]{../Pictures/active_research}
}
\caption{Conceptualization of the process of Carbon Capture, Utilization,
and Sequestration highlighting active research
areas.}
{\raggedright\tiny Source: \fullcite{2012FracfocusChemical}\par}
\label{fig:active_research}
\end{minipage}
\end{figure}
\end{block}
\end{frame}

\end{document}


• Any suggestions on how to cite the source of the image? Mar 10, 2015 at 22:38
• Why would the Boadilla theme mess with the foot note label? When applied the Boadilla theme, the label in the text reads '1', but in the actual foot note reads 'a'. Mar 10, 2015 at 22:55
• @EduardoSanchez Instead of a footnote, I'd use something like \caption{Conceptualization of the process of Carbon Capture, Utilization, and Sequestration highlighting active research areas.} {\raggedright\tiny Source: \fullcite{2012FracfocusChemical}\par} \label{fig:active_research} Mar 10, 2015 at 23:19
• @EduardoSanchez Regarding the Boadilla issue, it is because \footnotetext is inside the block; either move it outside the block or don't use footnotes at all and use the method I suggested in my previous comment. Mar 10, 2015 at 23:34

For anyone still having this problem, including the caption package (add \usepackage{caption} at the beginning of the file) removes the second citation.