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%\cite{Sahai:IPAC2015-WEPJE001}
\bibitem{Sahai:IPAC2015-WEPJE001}
A. A. Sahai, T.C. Katsouleas,
\textquotedblleft{Optimal Positron-Beam Excited Plasma Wakefields in Hollow and Ion-Wake Channels}\textquotedblright,
% --- abbreviated form (published paper) - JACoW template Feb 2018 ---
in \emph{Proc. IPAC'15}, Richmond, VA, USA, May 2015, pp. 2674--2677,
\url{doi:10.18429/JACoW-IPAC2015-WEPJE001}
% --- complete form (published paper) - JACoW template Feb 2018 ---
% in \emph{Proc. 6th International Particle Accelerator Conference (IPAC'15)}, Richmond, VA, USA, May 2015,
% pp. 2674--2677, \url{doi:10.18429/JACoW-IPAC2015-WEPJE001}
% --- additional material ---
% ISBN: 978-3-95450-168-7, \url{http://jacow.org/ipac2015/papers/wepje001.pdf}