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WikiPedia: Truy_cập_mở http://www.essachess.com/index.php/jcs/article/vie... http://lj.libraryjournal.com/2012/04/academic-libr... http://legacy.earlham.edu/~peters/fos/overview.htm http://oad.simmons.edu/ http://www.unesco.org/new/en/communication-and-inf... //tools.wmflabs.org/ftl/cgi-bin/ftl?st=wp&su=Truy+... //tools.wmflabs.org/ftl/cgi-bin/ftl?st=wp&su=Truy+... //www.worldcat.org/oclc/1040261573 //www.worldcat.org/oclc/757073363 https://cyber.harvard.edu/hoap/Open_Access_Trackin...