The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
R. Hajima et al., “Application of Infrared FEL Oscillators for Producing Isolated Attosecond X-Ray Pulses via High-Harmonic Generation in Rare Gases”, in Proc. FEL'19, Hamburg, Germany, Aug. 2019, pp. 272-275. doi:10.18429/JACoW-FEL2019-TUD02