The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{li:fel2019-tup038}
\bibitem{li:fel2019-tup038}
Y.S. Li, K. Kim, and R.R. Lindberg,
\textquotedblleft{Axial Symmetry in Spontaneous Undulator Radiation for XFELO Two-Bunch Experiment}\textquotedblright,
% --- abbreviated form (published paper) - JACoW template Feb 2018 ---
in \emph{Proc. FEL'19}, Hamburg, Germany, Aug. 2019, pp. 134--137.
\url{doi:10.18429/JACoW-FEL2019-TUP038}
% --- additional material -ISSN/ISBN--
% ISBN: 978-3-95450-210-3, ISSN: ""