The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
C. Kim, H.-S. Kang, I.S. Ko, and C.-K. Min, “Femtosecond Synchronization of PAL-XFEL”, presented at the 7\textsuperscript{th} Int. Beam Instrumentation Conf. (IBIC'18), Shanghai, China, Sep. 2018, paper WEOA01, unpublished.