The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
S. Di Mitri, G. De Ninno, R. Fabris, S. Spampinati, and N. Thompson, “Simple and Robust Free Electron Laser Doubler”, in Proc. FEL'19, Hamburg, Germany, Aug. 2019, pp. 609-612. doi:10.18429/JACoW-FEL2019-THP010