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Submitted on: 03 August 2018.
Revised on: 04 September 2018.
Accepted on: 20 September 2018.
MATHEMATICAL SOCIAL SCIENCES
Submitted on: 12 March 2003.
Revised on: 05 April 2003.
Accepted on: 25 April 2003.
MATHEMATICAL SOCIAL SCIENCES---ELSEVIER
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Submitted on: 12 November 2007.
Revised on: 26 November 2007.
Accepted on: 08 December 2007.
MATHEMATICAL SOCIAL SCIENCES
Submitted on: 15 July 1998.
Revised on: 23 July 1998.
Accepted on: 02 August 1998.
MATHEMATICAL SOCIAL SCIENCES---ELSEVIER
Submitted on: 18 June 1998.
Revised on: 09 July 1998.
Accepted on: 20 July 1998.
MATHEMATICAL SOCIAL SCIENCES