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Submitted on: 07 June 1998.
Revised on: 13 July 1998.
Accepted on: 23 July 1998.
TWMS Journal of Applied and Engineering Mathematics
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Submitted on: 26 March 2002.
Revised on: 03 April 2002.
Accepted on: 15 April 2002.
TWMS Journal of Applied and Engineering Mathematics
Submitted on: 05 July 2004.
Revised on: 15 August 2004.
Accepted on: 07 September 2004.
TWMS Journal of Applied and Engineering Mathematics
Submitted on: 06 January 2011.
Revised on: 18 January 2011.
Accepted on: 29 January 2011.
TWMS Journal of Applied and Engineering Mathematics
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Submitted on: 31 December 2004.
Revised on: 10 February 2005.
Accepted on: 03 March 2005.
TWMS Journal of Applied and Engineering Mathematics