van der Geer, C. A. J., Bakker, R. J., van der Meer, A. F. G., van Amersfoort, P. W., Gillespie, W. A., Saxon, G. ., & Poole, M. W. (1993). A Low-Energy-Spread Rf Accelerator for a Far-Infrared Free-Electron Laser. Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 334, 607-616. https://doi.org/10.1016/0168-9002(93)90828-6 (Original work published)
DIFFER