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Submitted on: 12 April 2001.
Revised on: 25 July 2001.
Accepted on: 07 September 2001.
___________________HABITAT INTERNATIONAL---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 11 June 2010.
Revised on: 13 August 2010.
Accepted on: 23 August 2010.
___________________HABITAT INTERNATIONAL---PERGAMON-ELSEVIER SCIENCE LTD
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