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"Open Access (OA) is a means of disseminating scholarly and scientific literature over the internet free of charge to researchers and to anyone else who might benefit from accessing the results of publicly funded research "
"in summary... Gold | open access publishing Green | can archive pre-print and post-print Blue | can archive post-print (ie final draft post-refereeing) Yellow | can archive pre-print (ie pre-refereeing) White | archiving not formally supported..."