How to hide references from navigation bar in beamer class?

Question

I am doing a presentation using the beamer class with the Warsaw theme. Further, I have to disclose my bibliography at the end of the presentation. Unfortunately, as soon as I type in

\bibliography{}

it is automatically treated as another section and therefor displayed in the navigation bar. However, I would like to hide this from the navigation bar. If it was a "normal" section/subsection, I simply could rely on

\section[]{section1} or \subsection[]{1.1}

using empty square brackets. But obviously, as mentioned above, beamer treats the command for bibliography automatically as another section.

Hence, is there any simple code to hide exclusively the "reference section" from the navigation bar?

I am using natbib following this question here: Beamer and Natbib

Consequently, the MWE looks as follows:

\documentclass[12pt,english,hideothersubsections]{beamer}

%-------style of references------
\usepackage[sort]{natbib}
\setcitestyle{round,comma,aysep={,}}
\usepackage{filecontents}
%-----------

%------LAYOUT--------
\usetheme{Warsaw}%vordefiniertes Layout.
\usecolortheme{wolverine}%vordefinierte Farbgebung.
\usefonttheme{professionalfonts}%Schriftart.

%---------------
%Content titlepage:
\title[]{title}
\date[]{\today}
\author[]{author}
\institute{institution}
%--------------

\begin{document}

\makeatletter

\begin{frame}[plain]
\hspace*{-\beamer@leftsidebar}%
\advance\textwidth by \beamer@leftsidebar\relax
\beamer@leftsidebar=\z@
\begin{minipage}{\textwidth}\par%
  \maketitle
\end{minipage}
\end{frame}
\makeatother

\section{section 1}
\subsection{subsection 1.1}
\begin{frame}
    text 1
\end{frame}

\section{section 2}
\subsection{subsection 2.1}
\begin{frame}
    text 2
\end{frame}

\section{section 3}
\subsection{subsection 3.1}
\begin{frame}
    text 3
\end{frame}


%\section[]{References}

\begin{frame}{}
\scriptsize

\bibliographystyle{abbrvnat}
\bibliography{MAbib}
\end{frame}

\end{document}

I do not know how to implement in the MWE a source for bibtex. Hopefully it is working anyway.

Thanks in advance for any input!

Answer 1

Form your MWE, it is clear that you want to suppress the entry from the navigation bar and not from the sidebar.

Anyways, I can offer you two options:

1) To use \appendix just before your bibliography (the entry will still appear in the navigation bar but not in the "main" navigation bar but on a navigation of its own):

\documentclass[12pt,english,hideothersubsections]{beamer}
\usepackage[sort]{natbib}
\usetheme{Warsaw}%vordefiniertes Layout.
\usecolortheme{wolverine}%vordefinierte Farbgebung.
\usefonttheme{professionalfonts}%Schriftart.

\usepackage{filecontents}
\begin{filecontents*}{biblio.bib}
@article{testa,
  author = {The A Author},
  year = {2014},
  title = {The title A},
  journal = {The journal A},
  pages = {1--5},
}
@article{testb,
  author = {The B Author},
  year = {2014},
  title = {The title B},
  journal = {The journal B},
  pages = {6--10},
}
\end{filecontents*}

\begin{document}

\section{section 1}

\subsection{subsection 1.1}
\begin{frame}
    text 1
\end{frame}

\section{section 2}
\subsection{subsection 2.1}
\begin{frame}
    text 2
\end{frame}

\appendix

\begin{frame}{}
\bibliographystyle{abbrvnat}
\bibliography{biblio}
\end{frame}

\end{document}

The result:

2) Redefine \bibsection to be, for example, \section[]{\refname}:

\documentclass[12pt,english,hideothersubsections]{beamer}
\usepackage[sort]{natbib}
\usetheme{Warsaw}%vordefiniertes Layout.
\usecolortheme{wolverine}%vordefinierte Farbgebung.
\usefonttheme{professionalfonts}%Schriftart.

\usepackage{filecontents}
\begin{filecontents*}{biblio.bib}
@article{testa,
  author = {The A Author},
  year = {2014},
  title = {The title A},
  journal = {The journal A},
  pages = {1--5},
}
@article{testb,
  author = {The B Author},
  year = {2014},
  title = {The title B},
  journal = {The journal B},
  pages = {6--10},
}
\end{filecontents*}

\renewcommand\bibsection{\section[]{\refname}}

\begin{document}

\section{section 1}

\subsection{subsection 1.1}
\begin{frame}
    text 1
\end{frame}

\section{section 2}
\subsection{subsection 2.1}
\begin{frame}
    text 2
\end{frame}

\begin{frame}{}
\bibliographystyle{abbrvnat}
\bibliography{biblio}
\end{frame}

\end{document}

The result: