%\cite{Gudkov:FEL2015-MOP038}
\bibitem{Gudkov:FEL2015-MOP038}
    B.A.~Gudkov, S.~Bae, K.H.~Jang, Y.U.~Jeong, H.W.~Kim, K.~Lee, \emph{et al.},
%   B.A. Gudkov \emph{et al.},
   \textquotedblleft{Stabilization of Magnetron Frequency for a Microtron-Driven FEL}\textquotedblright,
%  in \emph{Proc. FEL2015}, MOP038, pp. 107--109,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOP038, pp. 107--109,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOP038, pp. 107--109,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop038.pdf},
    doi:10.18429/JACoW-FEL2015-MOP038, 2015.