RETRACTED: A GIS-based gradient analysis of urban landscape pattern of Shanghai metropolitan area, China

Reason: This article substantially copies an article by Matthew Luck and Jianguo Wu, “A gradient analysis of urban landscape pattern: a case study from the Phoenix metropolitan region, Arizona, USA” published in Landscape Ecology 17 (4), pp 327–339, 2002. The authors Zhang et al. have indicated in response to a query from the editor that this does not amount to plagiarism because the Luck article was cited in their paper In my view, the amount copied exceeds the usual purpose of citation (to refer to prior relevant work) and amounts to plagiarism.