%\cite{Hogan:FEL2015-WEC01}
\bibitem{Hogan:FEL2015-WEC01}
    M.J.~Hogan,
   \textquotedblleft{A Concept for a Plasma Wakefield Accelerator Driven FEL}\textquotedblright,
%  presented at FEL2015, Daejeon, Republic of Korea, August 2015, paper WEC01, unpublished.
   presented at the 37th International Free Electron Laser Conference (FEL2015), Daejeon, Republic of Korea, August 2015, paper WEC01, unpublished.