Submitted on: 18 December 2006.
Revised on: 22 March 2007.
Accepted on: 05 May 2007.
___________________INSURANCE MATHEMATICS & ECONOMICS
http://reply.papertrans.cn/2/128/12712/12712-32.png
http://reply.papertrans.cn/2/128/12712/12712-33.png
http://reply.papertrans.cn/2/128/12712/12712-34.png
Submitted on: 04 July 2022.
Revised on: 04 September 2022.
Accepted on: 07 October 2022.
___________________INSURANCE MATHEMATICS & ECONOMICS
http://reply.papertrans.cn/2/128/12712/12712-36.png