1. W J Baker,A History of the Marconi Company, New York: Macmillan, 1984, ch. 6, pp. 61–73.
2. O E Dunlap, Jr,Marconi—The Man and His Wireless.New York: Macmillan, 1937, eh VIII, p 95.
3. R N Vyvyan,Wireless Over Thirty Years, London: Routledge 1933, pp 29–30.
4. On a self-recovering coherer and the study of the cohering action of different metals