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%\cite{Huang:FEL2017-TUA05} \bibitem{Huang:FEL2017-TUA05} S. Huang, Y. Ding, Y. Feng, E. Hemsing, Z. Huang, J. Krzywinski, \emph{et al.}, % S. Huang, Y. Ding, Y. Feng, E. Hemsing, Z. Huang, J. Krzywinski, A.A. Lutman, A. Marinelli, T.J. Maxwell, and D. Zhu, % S. Huang \emph{et al.}, \textquotedblleft{Generating Subfemtosecond Hard X-Ray Pulses with Optimized Nonlinear Bunch Compression}\textquotedblright, presented at FEL2017, Santa Fe, NM, USA, Aug. 2017, paper TUA05, unpublished. % presented at the 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper TUA05, unpublished.