The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Kuhlmann:IPAC2017-WEPAB027}
\bibitem{Kuhlmann:IPAC2017-WEPAB027}
M. Kuhlmann, E. Schneidmiller, and M.V. Yurkov,
\textquotedblleft{Frequency Doubler and Two-color Mode of Operation at Free Electron Laser FLASH2}\textquotedblright,
% in \emph{Proc. IPAC2017}, pp. 2635--2638,
% in \emph{Proc. IPAC2017}, Copenhagen, Denmark, May 2017, paper WEPAB027, pp. 2635--2638,
in \emph{Proc. 8th Int. Particle Accelerator Conf. (IPAC'17)},
Copenhagen, Denmark, May 2017, paper WEPAB027, pp. 2635--2638,
% ISBN: 978-3-95450-182-3,
\url{http://jacow.org/ipac2017/papers/wepab027.pdf},
\url{https://doi.org/10.18429/JACoW-IPAC2017-WEPAB027}, 2017.