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%\cite{Sasaki:IPAC2015-TUPWA061}
\bibitem{Sasaki:IPAC2015-TUPWA061}
S. Sasaki, M. Hosaka, M. Katoh, T. Konomi, A. Miyamoto, and N. Yamamoto,
\textquotedblleft{Analyses of Light's Orbital Angular Momentum from Helical Undulator Harmonics}\textquotedblright,
% --- abbreviated form (published paper) - JACoW template Feb 2018 ---
in \emph{Proc. IPAC'15}, Richmond, VA, USA, May 2015, pp. 1563--1566,
\url{doi:10.18429/JACoW-IPAC2015-TUPWA061}
% --- complete form (published paper) - JACoW template Feb 2018 ---
% in \emph{Proc. 6th International Particle Accelerator Conference (IPAC'15)}, Richmond, VA, USA, May 2015,
% pp. 1563--1566, \url{doi:10.18429/JACoW-IPAC2015-TUPWA061}
% --- additional material ---
% ISBN: 978-3-95450-168-7, \url{http://jacow.org/ipac2015/papers/tupwa061.pdf}