Submitted on: 17 July 1999.
Revised on: 08 August 1999.
Accepted on: 03 October 1999.
___________________Environmental Earth Sciences---SPRINGER
Submitted on: 01 April 1998.
Revised on: 23 April 1998.
Accepted on: 21 June 1998.
___________________Environmental Earth Sciences---SPRINGER
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Submitted on: 04 February 2012.
Revised on: 25 February 2012.
Accepted on: 20 April 2012.
___________________Environmental Earth Sciences---SPRINGER
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