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Table 3 Types of cited references from the PMC open access subset

From: Using cited references to improve the retrieval of related biomedical documents

Reference type # References PubMed coverage (%)
journal 12415337 87.8
book 649775 1.1
webpage 21523 0.1
conference proceedings 15499 1.1
web 8711 2.7
others 626728 3.5
TOTAL 13737573 79.5