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Submitted on: 19 December 2002.
Revised on: 06 March 2003.
Accepted on: 02 May 2003.
___________________Environment and Urbanization ASIA
Submitted on: 01 October 2007.
Revised on: 07 December 2007.
Accepted on: 19 December 2007.
___________________Environment and Urbanization ASIA
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