Submitted on: 28 May 2000.
Revised on: 18 June 2000.
Accepted on: 11 August 2000.
___________________Applied Mathematics E-Notes---TSING HUA UNIV, DEPT MATHEMATICS
Submitted on: 03 August 2009.
Revised on: 26 September 2009.
Accepted on: 19 November 2009.
___________________Applied Mathematics E-Notes---TSING HUA UNIV, DEPT MATHEMATICS
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Submitted on: 01 March 2010.
Revised on: 16 June 2010.
Accepted on: 30 June 2010.
___________________Applied Mathematics E-Notes---TSING HUA UNIV, DEPT MATHEMATICS
Submitted on: 19 August 2011.
Revised on: 01 November 2011.
Accepted on: 03 December 2011.
___________________Applied Mathematics E-Notes---TSING HUA UNIV, DEPT MATHEMATICS
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Submitted on: 30 April 2016.
Revised on: 02 June 2016.
Accepted on: 04 July 2016.
___________________Applied Mathematics E-Notes---TSING HUA UNIV, DEPT MATHEMATICS
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