%\cite{Choi:FEL2015-MOP047}
\bibitem{Choi:FEL2015-MOP047}
    H. J.~Choi, K.H.~Gil, H.-S.~Kang, S.H.~Kim, and K.W.~Seo,
   \textquotedblleft{The BINP HLS to Measure Vertical Changes on PAL-XFEL Buildings and Ground}\textquotedblright,
%  in \emph{Proc. FEL2015}, MOP047, pp. 133--135,
%  in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOP047, pp. 133--135,
   in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOP047, pp. 133--135,
    ISBN: 978-3-95450-134-2,
    \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop047.pdf},
    doi:10.18429/JACoW-FEL2015-MOP047, 2015.