Articles
PaperChase: a computer program to search the medical literature.. N Engl J Med. 305(16):924-30.
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1981. PaperChase: computerized bibliographical retrieval for the physician.. J Med Pract Manage. 3(4):255-63.
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1988. Medical subject headings used to search the biomedical literature.. J Am Med Inform Assoc. 8(4):317-23.
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2001.