The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Wolff-Fabris:FEL2017-WEP054}
\bibitem{Wolff-Fabris:FEL2017-WEP054}
F. Wolff-Fabris, Y. Li, and J. Pflüger,
\textquotedblleft{The Magnetic Field Integral Hysteresis on the European XFEL Gap Movable Undulator Systems}\textquotedblright,
in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-WEP054}, 2018.
% in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-WEP054}, pp. 522--524.
% in \emph{Proc. FEL2017}, Santa Fe, NM, USA, Aug. 2017, paper WEP054, \url{https://doi.org/10.18429/JACoW-FEL2017-WEP054}
% in \emph{Proc. 38th Int. Free Electron Laser Conf. (FEL'17)},
% Santa Fe, NM, USA, Aug. 2017, paper WEP054, pp. 522--524,
% ISBN: 978-3-95450-179-3,
% \url{http://jacow.org/fel2017/papers/wep054.pdf},
% \url{https://doi.org/10.18429/JACoW-FEL2017-WEP054}, 2018.