[1]The environmental Kuznets curve (EKC): a logistic curve?  
Author: Sanjeev K. Sobhee
Applied Economics Letters, Volume 11, Issue 7 June 2004 , pages 449 - 452

[2]The Interaction of Population Growth and Environmental Quality
[size=-1]Cropper, C Griffiths -
[size=-1]American Economic Review, 1994

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