84.47.+w Vacuum tubes
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V.A. Cherepenin “Relativistic multiwave oscillators and their possible applications” 49 1097–1102 (2006)
01.10.Fv, 78.70.Gq, 84.40.Fe, 84.47.+w (all)
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V.P. Bykov “Photocounts and laser detection of weak optical signals” 48 469–486 (2005)
42.50.−p, 84.47.+w, 85.60.Gz (all)
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A.S. Tager “The avalanche-transit diode and its use in microwaves” 9 892–912 (1967)
85.30.Kk, 72.20.Ht, 84.47.+w (all)
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L.V. Iogansen “Thin-film electron interferometers” 8 413–416 (1965)
85.30.Mn, 73.50.−h, 73.40.Gk, 84.47.+w (all)
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A.I. Fyurstenberg “Comparison of frequencies by the sinusoidal and elliptic sweep methods” 2 469–480 (1959)
07.07.Hj, 84.47.+w (all)
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