\section{Bibliography}
\subsection{Sources}

\begin{itemize}
\item Versuchsanleitung Positronenvernichtung, Andres van der Schaaf, 15.02.06
\end{itemize}

\subsection{Graphics}

\begin{itemize}
\item Figure \ref{Na-decay}: \url{https://www.nucleonica.com/Application/ReducedDecaySchemes/Na22_RDS.png}
\end{itemize}