%\cite{Vecchione:FEL2015-WEP002} \bibitem{Vecchione:FEL2015-WEP002} T.~Vecchione, \textquotedblleft{Simulating Single Crystal Copper Photocathode Emittance}\textquotedblright, % in \emph{Proc. FEL2015}, WEP002, pp. 587--591, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper WEP002, pp. 587--591, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper WEP002, pp. 587--591, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep002.pdf}, doi:10.18429/JACoW-FEL2015-WEP002, 2015.