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Submitted on: 21 May 2008.
Revised on: 31 May 2008.
Accepted on: 18 June 2008.
Scandinavian Actuarial Journal
Submitted on: 21 March 2009.
Revised on: 05 April 2009.
Accepted on: 29 April 2009.
Scandinavian Actuarial Journal
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Submitted on: 06 August 2018.
Revised on: 02 September 2018.
Accepted on: 10 September 2018.
Scandinavian Actuarial Journal
Submitted on: 01 October 2016.
Revised on: 28 October 2016.
Accepted on: 07 November 2016.
Scandinavian Actuarial Journal
http://reply.papertrans.cn/3/276/27504/27504-17.png
http://reply.papertrans.cn/3/276/27504/27504-18.png
Submitted on: 27 December 2000.
Revised on: 11 January 2001.
Accepted on: 17 January 2001.
Scandinavian Actuarial Journal
Submitted on: 07 July 1999.
Revised on: 20 July 1999.
Accepted on: 30 July 1999.
Scandinavian Actuarial Journal