The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Ackermann:IPAC2017-WEPIK064} \bibitem{Ackermann:IPAC2017-WEPIK064} W. Ackermann, H. De Gersem, and T. Weiland, \textquotedblleft{Eigenvalue Calculations Based on the Finite Element Method With Physically Motivated Field Smoothing Using the Kirchhoff Integral}\textquotedblright, % in \emph{Proc. IPAC2017}, pp. 3074--3076, % in \emph{Proc. IPAC2017}, Copenhagen, Denmark, May 2017, paper WEPIK064, pp. 3074--3076, in \emph{Proc. 8th Int. Particle Accelerator Conf. (IPAC'17)}, Copenhagen, Denmark, May 2017, paper WEPIK064, pp. 3074--3076, % ISBN: 978-3-95450-182-3, \url{http://jacow.org/ipac2017/papers/wepik064.pdf}, \url{https://doi.org/10.18429/JACoW-IPAC2017-WEPIK064}, 2017.