Free online availability substantially increases a... [Nature. 2001]

The prohibitive costs of accessing evidence online. [J Contin Educ Nurs. 2004]
The prohibitive costs of accessing evidence online.
Edwards N, Lockett D. J Contin Educ Nurs. 2004 Mar-Apr; 35(2):89-90.
Open access could reduce cost of scientific publishing. [BMJ. 2004]
Open access could reduce cost of scientific publishing.
Mayor S. BMJ. 2004 May 8; 328(7448):1094.
All health information should be free to the developing world? [Trop Med Int Health. 2002]
All health information should be free to the developing world?
Eyers JE. Trop Med Int Health. 2002 Aug; 7(8):637-8.
Review Is that it? How online articles have changed over the past five years. [BMJ. 2002]
Review Is that it? How online articles have changed over the past five years.
Delamothe T. BMJ. 2002 Dec 21; 325(7378):1475-8.
Review Electronic publishing in radiology: economics and the future. [J Am Coll Radiol. 2004]
Review Electronic publishing in radiology: economics and the future.
Chew FS, Llewellyn KT, Olsen KM. J Am Coll Radiol. 2004 Nov; 1(11):815-23.

Systematic differences in impact across publication tracks at PNAS. [PLoS One. 2009]
Systematic differences in impact across publication tracks at PNAS.
Rand DG, Pfeiffer T. PLoS One. 2009 Dec 1; 4(12):e8092. Epub 2009 Dec 1.
Chinese Medicine (CM) matters. [Chin Med. 2008]
Chinese Medicine (CM) matters.
Un C, Cheang L, Lei J, Leung SW, Yeung HW. Chin Med. 2008 Nov 28; 3:16. Epub 2008 Nov 28.
Review Defrosting the digital library: bibliographic tools for the next generation web. [PLoS Comput Biol. 2008]
Review Defrosting the digital library: bibliographic tools for the next generation web.
Hull D, Pettifer SR, Kell DB. PLoS Comput Biol. 2008 Oct; 4(10):e1000204. Epub 2008 Oct 31.

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Free online availability substantially increases a paper's impact.
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