1. Automorphism Groups and Quotients of Strongly Connected Automata and Monadic Algebras;Bayer,1966
2. On endomorphisms and congruences of automata;Bayer,1967
3. Isomorphism groups of automata;Fleck;J. Assoc. Comput. Mach.,1962
4. Algebraic Theory of Sequential Machines;Hartmanis,1966
5. Iterative Network Realization of Sequential Machines;Jump,1968