Submitted on: 13 October 2019.
Revised on: 09 November 2019.
Accepted on: 06 December 2019.
___________________INSURANCE MATHEMATICS & ECONOMICS
Submitted on: 14 September 2016.
Revised on: 09 January 2017.
Accepted on: 13 February 2017.
___________________INSURANCE MATHEMATICS & ECONOMICS
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Submitted on: 24 March 2007.
Revised on: 09 July 2007.
Accepted on: 13 August 2007.
___________________INSURANCE MATHEMATICS & ECONOMICS
http://reply.papertrans.cn/2/128/12713/12713-35.png
Submitted on: 09 November 2006.
Revised on: 14 January 2007.
Accepted on: 12 March 2007.
___________________INSURANCE MATHEMATICS & ECONOMICS