The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Balandin:IPAC2017-MOPIK069} \bibitem{Balandin:IPAC2017-MOPIK069} V. Balandin, N. Golubeva, \textquotedblleft{Approximate Matrices for Modeling the Focusing of the Undulator Periods and Undulator End Fields}\textquotedblright, % in \emph{Proc. IPAC2017}, pp. 686--688, % in \emph{Proc. IPAC2017}, Copenhagen, Denmark, May 2017, paper MOPIK069, pp. 686--688, in \emph{Proc. 8th Int. Particle Accelerator Conf. (IPAC'17)}, Copenhagen, Denmark, May 2017, paper MOPIK069, pp. 686--688, % ISBN: 978-3-95450-182-3, \url{http://jacow.org/ipac2017/papers/mopik069.pdf}, \url{https://doi.org/10.18429/JACoW-IPAC2017-MOPIK069}, 2017.