The Shakespearean ciphers examined : an analysis of cryptographic systems used as evidence that some author other than William Shakespeare wrote the plays commonly attributed to him - Friedman, William Frederick, 1891-1969; Friedman, Elizebeth Smith, 1893-1980 (Cambridge [Eng.] : University Press, 1957)
Keywords: Shakespeare, William, -- 1564-1616 -- Authorship; Ciphers