The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
A.L. Zhang et al., “The Emittance Measurement of Proton Beam in a Compact Laser Plasma Accelerator”, presented at the 13th Symposium on Accelerator Physics (SAP'17), Jishou, China, Aug. 2017, paper TUPH02, unpublished.