4Bo-Chrisfer Bj? rk, Patrik Welling, et al. Open Access to the Scientific Journal Literature: Situation 2009[J]. PIoS ONE, 2010, Vol. 5(6): el 1237.
5Doug Way.The Open Access Availability of Library and Information Science Literature[OL/J]. [2011-03-17]. http:// works.bepress.com/cgi/viewcontent.cgi? article=1001&context:doug_way&sei-redir=1#search= % 22The+Open+ Access+Availability+of+Library+and+lnformation+Science+Literature%22, College & Research Libraries, 2010 (7): 302-308.