Article Goerth, Joachim (2019)
Wie war das mit dem zweiten Gitter? Joachim Gerth über die Entwicklung der Raumlade- und Schirmgitterröhren für das frühe Radio. (How was that with the second grid? Joachim Gerth on the development of the space charging and screen grid tubes for the early radio.). Funkgeschichte (pp. 100-105). (/isis/citation/CBB653187483/) unapi

Article Garson, Justin; Casper, Stephen T. (2015)
The Birth of Information in the Brain: Edgar Adrian and the Vacuum Tube. Science in Context (pp. 31-52). (/isis/citation/CBB001552001/) unapi

Article Vatz, Mara E. (Spring 2009)
Long Live Vacuum Tubes. American Heritage of Invention and Technology (pp. 12-14). (/isis/citation/CBB114964966/) unapi