\documentclass{beamer}

\usepackage[backend=biber, style=authoryear-icomp]{biblatex}
\resetcounteronoverlays{exx}
\usepackage{tikz}
\usepackage{blindtext}
\usepackage{tipa}
\usepackage{cgloss4e}
\usepackage{gb4e}
\usepackage{qtree}
\usepackage{enumerate}
\usepackage{longtable}
\usepackage{textgreek}
\usepackage{parskip}
\usepackage{color}
\addbibresource{$HOME/Documents/LaTeX/uni.bib}


\usetheme{Copenhagen}
\setbeamertemplate{frametitle}[default][center]
\setlength{\parskip}{12pt}

\title{<++>}
\author{Alexander Bocken}
\institute{ETH Zürich}

\begin{document}

\begin{frame}

\maketitle

\end{frame}

\section{<++>}

\begin{frame}
\frametitle{<++>}

<++>


\end{frame}

<++>

\section{References}

\begin{frame}
\frametitle{References}
\printbibliography
\end{frame}

\end{document}