四極真空管
CRC Press. pp. 35–36. ISBN 9781107636187. https://books.google.com/books?id=uYgsr3exvS4C&pg=PA36 (Brown incorrectly gives Ando as first screen grid patent and gives incorrect account of Schottky).
↑ Editors (Sept. 21, 1927) "Guide to the Show Olympia 1927". Wireless World. p. 375. Retrieved Oct. 12 2021
↑ Turner, L.B. (1931) p. 257
↑ E. T. Cunningham, Inc. (1932) The Cunningham Radio Tubes Manual, Technical Series No. C-10, Harrison, NJ: E. T. Cunningham, Inc. pp. 22, 28
↑ Henney, K. (1938) Principles of Radio, 3rd ed.. New York: John Wiley & Sons, Inc. pp. 327 - 328. Retrieved 14 Oct. 2021
↑ Hull, Albert W. (April 1926) "Measurements of High Frequency Amplification with Shielded-Grid Pliotrons". Physical Review Vol.