The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
M. Hosaka et al., “Experimental Study on Optical Vortex from a Helical Undulator at UVSOR-III”, in Proc. 7th Int. Particle Accelerator Conf. (IPAC'16), Busan, Korea, May 2016, paper WEOAA03, pp. 2036-2038, ISBN: 978-3-95450-147-2, doi:10.18429/JACoW-IPAC2016-WEOAA03, http://jacow.org/ipac2016/papers/weoaa03.pdf, 2016.