\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{uni}

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

\title          {}
\author         {}
\institute      {}
\date           {}

\begin{document}

\begin{frame}
	\maketitle
\end{frame}

\section{}
\begin{frame}
	\frametitle{}

\end{frame}

\section{Referenzen}
\begin{frame}
	\frametitle{Referenzen}
	\printbibliography
\end{frame}
\end{document}