Copeland, Jack; Haeff, Andre A. (September 2015). "The True History of the Traveling Wave Tube". IEEE Spectrum. 52 (9): 38–43. doi:10.1109/MSPEC.2015.7226611. S2CID36963575.
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Copeland, Jack; Haeff, Andre A. (September 2015). "The True History of the Traveling Wave Tube". IEEE Spectrum. 52 (9): 38–43. doi:10.1109/MSPEC.2015.7226611. S2CID36963575.