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2. Paper chase: a computer-based reprint storage and retrieval system;Beckeley;Comput. Biomed. Res.,1977
3. Storage and retrieval of bibliographic references using a microprocessor system;Bertrand;Int. J. Bio-Med. Comput.,1980
4. Paper chase: a program to search the medical literature;Bleich;MD Comput.,1985
5. Dbase II;Edelson,1981