1. Proof of Shannon's transmission theorem for finite-state indecomposable channels;Blackwell;Ann. Math. Statist.,1958
2. Equivalent stochastic sequential machines;Carlyle,1961
3. Introduction to the Theory of Finite-State Machines;Gill,1962
4. Loop-free structure of sequential machines;Hartmanis;Inform. Control,1962
5. Finite Markov Chains;Kemeny,1960