1. Decision problems for tag system;Aanderaa;J. Symbolic Logic,1971
2. Real-Time deterministic languages;Harrison;SIAM J. Computing,1972
3. Strict deterministic grammars;Harrison;J. Comput. Systems Sci.,1973
4. Context-free languages and Turing machine computations;Hartmanis,1967
5. Formal Languages and Their Relation to Automata;Hopcroft,1969