1. Right-to-Left Parsing Using a Predictive Grammar;Abbott,1964
2. Formal properties of grammars;Chomsky,1963
3. The algebraic theory of context-free grammars;Chomsky,1963
4. Computability and Unsolvability;Davis,1958
5. On the relative efficiencies of context-free grammar recognizers;Griffiths;Communications Assoc. Comput. Mach.,1965