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Harnad, Stevan, Brody, Tim, Vallieres, Francois, Carr, Les, Hitchcock, Steve, Gingras, Yves, Oppenheim, Charles, Hajjem, Chawki and Hilf, Eberhardt (2008) The Access/Impact Problem and the Green and Gold Roads to Open Access: An Update Serials Review, 34, (1), pp. 36-40. (doi:10.1016/j.serrev.2007.12.005).