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INVERSE RELATIONSHIP BETWEEN PRODUCTIVITY AND FARM SIZE: THE CASE OF CHINA http://onlinelibrary.wiley.com/doi/10.1111/j.1465-7287.2010.00236.x/abstract;jsessionid=AA227BCD394A139BD8A26CD0836D4E9B.f01t04?deniedAccessCustomisedMessage=&userIsAuthenticated=false