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2. The Chemical Society research unit in information dissemination and retrieval;Kent;Svensk Kemisk Tidskrift,1968
3. Term Fragment Analysis for Inversion of Large Files;Schipma;Paper presented at meeting of Association of Scientific Information Dissemination Centers, Washington, D.C.,1971
4. Optimum procedures for economic information retrieval;Heaps;Inform. Star. Retr.,1970
5. Program design for retrospective searches on large data bases;Thiel;Inform. Stor. Retr.,1972