A Mathematical Theory of Communication – Shannon, 1948

Reprinted with corrections from The Bell System Technical Journal,
Vol. 27, pp. 379–423, 623–656, July, October, 1948.
A Mathematical Theory of Communication
By C. E. SHANNON

pdf – https://pdfs.semanticscholar.org/0404/bd58e5f1edbd288cd69fcbc224485af415bf.pdf