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Stephen Weyl; James F. Fries; Gio Wiederhold; Frank Germano (1975). «A Modular Self-describing Clinical Database System». Computers and Biomedical Research. 8 (3): 279–293. PMID1157469. doi:10.1016/0010-4809(75)90045-2.
Stephen Weyl; James F. Fries; Gio Wiederhold; Frank Germano (1975). «A Modular Self-describing Clinical Database System». Computers and Biomedical Research. 8 (3): 279–293. PMID1157469. doi:10.1016/0010-4809(75)90045-2.