Redhead, P. A. (1998-05-01). "The birth of electronics: Thermionic emission and vacuum". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 16 (3): 1394-1401. Bibcode:1998JVSTA..16.1394R. doi:10.1116/1.581157. ISSN0734-2101.
Redhead, P. A. (1998-05-01). "The birth of electronics: Thermionic emission and vacuum". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 16 (3): 1394-1401. Bibcode:1998JVSTA..16.1394R. doi:10.1116/1.581157. ISSN0734-2101.
Redhead, P. A. (1998-05-01). "The birth of electronics: Thermionic emission and vacuum". Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 16 (3): 1394-1401. Bibcode:1998JVSTA..16.1394R. doi:10.1116/1.581157. ISSN0734-2101.