http://reply.papertrans.cn/1/30/2913/2913-11.png
http://reply.papertrans.cn/1/30/2913/2913-12.png
http://reply.papertrans.cn/1/30/2913/2913-13.png
Submitted on: 08 December 1999.
Revised on: 28 March 2000.
Accepted on: 21 April 2000.
___________________Astin Bulletin-The Journal of the International Actuarial Association
http://reply.papertrans.cn/1/30/2913/2913-15.png
Submitted on: 29 July 2019.
Revised on: 15 October 2019.
Accepted on: 11 December 2019.
___________________Astin Bulletin-The Journal of the International Actuarial Association
Submitted on: 28 June 2005.
Revised on: 01 October 2005.
Accepted on: 03 November 2005.
___________________Astin Bulletin-The Journal of the International Actuarial Association
Submitted on: 20 January 2011.
Revised on: 19 February 2011.
Accepted on: 05 March 2011.
___________________Astin Bulletin-The Journal of the International Actuarial Association
http://reply.papertrans.cn/1/30/2913/2913-19.png
Submitted on: 14 June 2008.
Revised on: 29 August 2008.
Accepted on: 19 September 2008.
___________________Astin Bulletin-The Journal of the International Actuarial Association