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 	\bibitem{esolang:prog} Smurf --- Reversing input on Esolang,
 	\url{http://esolangs.org/wiki/Smurf#Reversing_input}. Opgehaald 27 mei 2016.
+
+	\bibitem{cleansmurf} \emph{CleanSmurf} --- Smurf interpreter in Clean,
+	\url{https://github.com/camilstaps/CleanSmurf}. Opgehaald 10 juni 2016.
 \end{thebibliography}