References
- “Radio progress during 1939”, Electronics—P.I.R.E., 28 (March 1940), 106.
- “200 kW valves with replaceable filaments”. Gen. Elec. Rev., 32 (Aug. 1939), 369.
- Electronic Valves—Part III (Transmitting Valves) (Philips Technical Library publication), 1951.
- Langmuir, I., Phys. Rev., 2 (1913), 450.
- Geppert, D. V., Basic Electron Tubes (McGraw-Hill Book Co.), 1951. pp. 116–19.
- Chaffe, E. L., Theory of Thermionic Vacuum Tubes (McGraw-Hill Book Co.), 1933, p. 178.
- Rossignol, R. L. & Hall, E. W., G.E.C. Journ., 7 (1936), 176.
- Idem, Marconi Rev., 61 (1936), 6.