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%\cite{szewinski:icalepcs2021-tupv024}
\bibitem{szewinski:icalepcs2021-tupv024}
J. Szewiński, P.R. Bartoszek, K. Chmielewski, K. Kostrzewa, T. Kowalski, P. Markowski, \emph{et al.},
% J. Szewiński, P.R. Bartoszek, K. Chmielewski, K. Kostrzewa, T. Kowalski, P. Markowski, D. Rybka, M. Sitek, and Z. Wojciechowski,
% J. Szewiński \emph{et al.},
\textquotedblleft{Preliminary Design of LLRF System for Polfel Accelerator}\textquotedblright,
% --- abbreviated form (UNpublished paper) - JACoW template Feb 2018 ---
presented at ICALEPCS'21, Shanghai, China, Oct. 2021, paper TUPV024, unpublished.