Corporation, Bonnier (5 August 1986). "Popular Science". Bonnier Corporation. Archived from the original on 31 March 2022. Retrieved 16 December 2020 – via Google Books.
U.S. Patent 2,692,532, "Cathode Ray Focusing Apparatus", Ernst O. Lawrence, University of California/Chromatic Television Laboratories (original Chromatron patent).
Corporation, Bonnier (5 August 1986). "Popular Science". Bonnier Corporation. Archived from the original on 31 March 2022. Retrieved 16 December 2020 – via Google Books.