References
- Vermeulen & Westmijze, Philips Tech. Rev., April 1950, p. 281.
- Murphy, Marconi Review No. 72, January-March 1939, p. 15.
- Maxwell, Donald, P.I.R.E., November 1947, p. 1349.
- Cook, E. G., Electronics, 12, June 1939, p. 38.
- Stewart, H. H. & Pollock, H. S., Electronics, 13, February 1940, p. 19.
- Sandeman, Radio Engineering (Chapman & Hall), Vol. II, 1949, p. 223.