Knippels, G. ., van der Meer, A. F. G., Mols, R. F. X. A. M., van Amersfoort, P. W., Vrijen, R. B., Maas, D. J., & Noordam, L. D. (1995). Generation of Frequency-Chirped Pulses in the Far-Infrared by Means of a Subpicosecond Free-Electron Laser and an External Pulse Shaper. Optics Communications, 118, 546-550. https://doi.org/10.1016/0030-4018(95)00289-k (Original work published)
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