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The Access/Impact Problem and the Green and Gold Roads to Open Access[J] . Stevan Harnad,Tim Brody,Fran?§ois Valli?¨res,Les Carr,Steve Hitchcock,Yves Gingras,Charles Oppenheim,Heinrich Stamerjohanns,Eberhard R. Hilf.Serials Review . 2004 (4)