%\cite{Hamberg:FEL2015-TUP057}
\bibitem{Hamberg:FEL2015-TUP057}
    M.~Hamberg,
   \textquotedblleft{The Highly Adjustable Magnet Undulator}\textquotedblright,
%  in \emph{Proc. FEL2015}, TUP057, pp. 499--500,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUP057, pp. 499--500,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUP057, pp. 499--500,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup057.pdf},
    doi:10.18429/JACoW-FEL2015-TUP057, 2015.