1. THEORY OF FINITE AUTOMATA;Memoirs of the Faculty of Science, Kyushu University. Series A, Mathematics;1962
2. The Theory of Automata, a Survey;Advances in Computers;1961
3. ON SOME SEQUENTIAL EQUATIONS;Memoirs of the Faculty of Science, Kyushu University. Series A, Mathematics;1960
4. Some remarks on abstract machines;Transactions of the American Mathematical Society;1960
5. TURING TRANSFORMATION AND STRONG COMPUTABILITY OF TURING COMPUTERS;Memoirs of the Faculty of Science, Kyushu University. Series A, Mathematics;1959