1. An Introduction to Cybernetics;Ross,1958
2. Finite-state languages: formal representations and adequacy problems;Bar-Hillel;Bull. Res. Council Israel,1960
3. The Theory of Graphs;Berge,1958
4. Equivalent Stochastic Sequential Machines;Carlyle,1961
5. Markov chains as random imput automata;Davis;Am. Math. Monthly,1961