The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
C.-H. Chang, C.H. Chang, T.Y. Chung, C.-S. Hwang, and C.Y. Kuo, “Construction of a Twin-Helix Undulator Prototype”, presented at the Mechanical Eng.~Design of Synchrotron Radiation Equipment and Instrumentation (MEDSI'18), Paris, France, Jun 2018, paper TUPH06, unpublished.