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Submitted on: 22 February 2000.
Revised on: 18 March 2000.
Accepted on: 15 April 2000.
___________________AIMS Environmental Science---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 27 August 2007.
Revised on: 06 October 2007.
Accepted on: 31 October 2007.
___________________AIMS Environmental Science---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 24 March 2000.
Revised on: 11 July 2000.
Accepted on: 19 August 2000.
___________________AIMS Environmental Science---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 19 September 1998.
Revised on: 16 January 1999.
Accepted on: 15 February 1999.
___________________AIMS Environmental Science---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 06 August 2019.
Revised on: 17 October 2019.
Accepted on: 13 December 2019.
___________________AIMS Environmental Science---AMER INST MATHEMATICAL SCIENCES-AIMS
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Submitted on: 13 October 2014.
Revised on: 09 February 2015.
Accepted on: 04 March 2015.
___________________AIMS Environmental Science---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 31 July 2023.
Revised on: 19 October 2023.
Accepted on: 28 November 2023.
___________________AIMS Environmental Science---AMER INST MATHEMATICAL SCIENCES-AIMS