The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{holldack:ipac2020-movir12}
\bibitem{holldack:ipac2020-movir12}
K. Holldack, F. Armborst, J. Bahrdt, W. Frentrup, P. Goslawski, N. Pontius, \emph{et al.},
% K. Holldack, F. Armborst, J. Bahrdt, W. Frentrup, P. Goslawski, N. Pontius, M. Ries, M. Scheer, A. Schälicke, and Ch. Schüssler-Langeheine,
% K. Holldack \emph{et al.},
\textquotedblleft{Alternating the Helicity of X-Ray Photons from an Undulator at Unprecedented Speed}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at IPAC'20, Caen, France, May 2020, paper MOVIR12, unpublished.