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2. Theory of finite automata with a variable structure;Agasandjan,1967
3. Criteria for the representation of events in finite probabilistic automata;Bukharaev;Dokl. Akad. Nauk SSSR,1965
4. The Mathematical Theory of Context-Free Languages;Ginsburg,1966
5. Finite automata and their decision problems;Rabin;IBM J. Res. Develop.,1959