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2. Procedures as a Representation for Data in a Computer Program for Understanding Natural Language;Winograd,1971
3. Experiments in automatic extracting and indexing;Earl;Inform. Star. Retr.,1970
4. Computer-detectable semantic structures;Robison;Inform. Stor. Retr.,1970
5. Mathematical Linguistics and Automatic Translation;Oettinger;Report to the United National Science Foundation, No. NSP-8,1963