%\cite{Zhao:FEL2015-TUB05}
\bibitem{Zhao:FEL2015-TUB05}
    G.~Zhao, C.H.~Chen, Y.C.~Chiu, S.~Huang, Y.-C.~Huang, K.X.~Liu, \emph{et al.},
%   G. Zhao \emph{et al.},
   \textquotedblleft{Tunable High-power Terahertz Free-Electron Laser Amplifier}\textquotedblright,
%  in \emph{Proc. FEL2015}, TUB05, pp. 305--307,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUB05, pp. 305--307,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUB05, pp. 305--307,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tub05.pdf},
    doi:10.18429/JACoW-FEL2015-TUB05, 2015.