The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Niknejadi:FEL2017-MOP043}
\bibitem{Niknejadi:FEL2017-MOP043}
P. Niknejadi, A. Aschikhin, C. Behrens, S. Bohlen, R.T.P. D'Arcy, J. Dale, \emph{et al.},
% P. Niknejadi, A. Aschikhin, C. Behrens, S. Bohlen, R.T.P. D'Arcy, J. Dale, L. Di Lucchio, M. Felber, B. Foster, L. Goldberg, J.-N. Gruse, Z. Hu, S. Karstensen, A. Knetsch, O. S. Kononenko, V. Libov, K. Ludwig, A.R. Maier, A. Martinez de la Ossa, F. Marutzky, T.J. Mehrling, M. Meisel, J. Osterhoff, C.A.J. Palmer, K. Poder, P. Pourmoussavi, M. Quast, J.-H. Röckemann, J. Schaffran, L. Schaper, H. Schlarb, B. Schmidt, S. Schreiber, C.B. Schroeder, S. Schröder, J.-P. Schwinkendorf, B. Sheeran, M.J.V. Streeter, G.E. Tauscher, V. Wacker, S. Weichert, S. Wesch, P. Winkler, S. Wunderlich, and J. Zemella,
% P. Niknejadi \emph{et al.},
\textquotedblleft{Plasma Wakefield Accelerated Beams for Demonstration of FEL Gain at FLASHForward}\textquotedblright,
in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-MOP043}, 2018.
% in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-MOP043}, pp. 140--143.
% in \emph{Proc. FEL2017}, Santa Fe, NM, USA, Aug. 2017, paper MOP043, \url{https://doi.org/10.18429/JACoW-FEL2017-MOP043}
% in \emph{Proc. 38th Int. Free Electron Laser Conf. (FEL'17)},
% Santa Fe, NM, USA, Aug. 2017, paper MOP043, pp. 140--143,
% ISBN: 978-3-95450-179-3,
% \url{http://jacow.org/fel2017/papers/mop043.pdf},
% \url{https://doi.org/10.18429/JACoW-FEL2017-MOP043}, 2018.