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David A. Huffman. Canonical forms for information-lossless finite-stale logical machines. Sequential machines, Selected papers, edited by Edward F. Moore, Addison-Wesley Publishing Company, Inc., Reading, Massachusetts, Palo Alto, and London, 1964, pp. 132–156. (Reprinted from IRE transactions on circuit theory, vol. CT-6, special supplement (1959), pp. 41–59.)