Selected references
- H. Allen Curtis. Multiple reduction of variable dependency of sequential machines. Journal of the ACM, 9(3):324-344, July 1962.
- H. Allen Curtis. A generalized tree circuit. Journal of the ACM, 8(4):484-496, October 1961.
- H. Allen Curtis. A functional canonical form. Journal of the ACM, 6(2):245-258, April 1959.
- J. Hartmanis. Loop-free structure of sequential machines. Information and Control, 5(1):25-43, March 1962.
- J. Hartmanis. Symbolic analysis of a decomposition of information processing machines. Information and Control, 3(2):154-178, June 1960.