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2. An efficient context-free parsing algorithm;Earley;Comm. Assoc. Comput. Mach.,1970
3. Comparative complexity of grammar forms;Ginsburg,1975
4. On the size of context-free grammars;Gruska;Kybernetica,1972
5. Strict deterministic grammars;Harrison;J. Comput. System Sci.,1973