1. Terminal context in context-sensitive grammars;Book;SIAM J. Computing,1972
2. The theory and application of pushdown store machines;Evey,1963
3. The Mathematical Theory of Context-free Languages;Ginsburg,1966
4. Mappings which preserve context-sensitive languages;Ginsburg;Information and Control,1966
5. Scan limited automata and context limited grammars;Hibbard,1966