Publicado en: Libro: Communication Theory. (Papers Read at a Symposium on "Applications of Communication Theory" Held at the Institution of Electrical Engineers, London, September 22nd-26th, 1952), pp. 273-287.
Publicado en: The Annals of Mathematical Statistics. Vol. 37, No. 6 (Dec., 1966), pp. 1554-1563 (10 pages). Published By: Institute of Mathematical Statistics.