1929/06/01 by Lester S. Hill · 4 citations
Computer Science · Engineering · #Coding theory and cryptography #graph theory and CDMA systems #semigroups and automata theory
paper · doi:10.1080/00029890.1929.11986963
(1929). Cryptography in An Algebraic Alphabet. The American Mathematical Monthly: Vol. 36, No. 6, pp. 306-312.