The proportion of peer reviewed scholarly journal articles, which are available openly in full text on the web, was studied using a random sample of 1837 titles and a web search engine. Of articles published in 2008, 8.5% were freely available at the publishers' sites. For an additional 11.9% free manuscript versions could be found using search engines, making the overall OA percentage 20.4%.
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0011273
http://www.plosone.org/article/info:doi/10.1371/journal.pone.0011273
KlausGraf - am Sonntag, 27. Juni 2010, 14:20 - Rubrik: English Corner
