4Kuiper J. A checklist approach to evaluate the contribution of organic farms to landscape quality. Agriculture, Ecosystems and Environment, 2000,77 : 143. 被引量：1
5Hansen B , Alroe H F , Kristensen E S. Approaches to assess the environmental impact of organic farming with particular regard to Denmark. Agriculture, Ecosystems and Environment, 2001,83 : 11 - 26. 被引量：1
6Myers J. Group certification: the answer for smallholder farmers? Ecology and Farming, 2002,29 : 24- 25. 被引量：1
7Kuiper J.A checklist approach to evaluate the contribution of organic farms to landscape quality.Agriculture,Ecosystems and Environment,2000,77:143 被引量：1
8Hansen B.,Alroe H. F.,Kristensen E. S. Approaches to assess the environmental impact of organic farming with particular regard to Denmark.Agriculture,Ecosystems and Environment,2001,83:11～26 被引量：1
9Myers J.Group certification:the answer for smallholder farmers?Ecology and Farming,2002,29:24～25 被引量：1
