Free online availability substantially increases a paper's impact.

National Library of Medicine (brackets, no "et al."): Lawrence S. Free online availability substantially increases a paper's impact. Nature. 2001;411(6837):521.
National Library of Medicine (grant proposals with PMCID/PMID): Lawrence S. Free online availability substantially increases a paper's impact. Nature. 2001;411(6837):521.
National Library of Medicine (NLM) - Grant with PMID: Lawrence S. Free online availability substantially increases a paper's impact. Nature. 2001;411(6837):521.
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