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Submitted on: 01 November 1998.
Revised on: 20 December 1998.
Accepted on: 30 January 1999.
___________________Astin Bulletin-The Journal of the International Actuarial Association
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Submitted on: 05 April 2011.
Revised on: 12 July 2011.
Accepted on: 13 August 2011.
___________________Astin Bulletin-The Journal of the International Actuarial Association
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Submitted on: 11 April 2019.
Revised on: 15 May 2019.
Accepted on: 06 July 2019.
___________________Astin Bulletin-The Journal of the International Actuarial Association
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