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Submitted on: 19 March 2004.
Revised on: 10 July 2004.
Accepted on: 13 August 2004.
___________________Annals of Actuarial Science---CAMBRIDGE UNIV PRESS
Submitted on: 19 October 2005.
Revised on: 08 December 2005.
Accepted on: 08 January 2006.
___________________Annals of Actuarial Science---CAMBRIDGE UNIV PRESS
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Submitted on: 05 December 2010.
Revised on: 19 January 2011.
Accepted on: 26 February 2011.
___________________Annals of Actuarial Science---CAMBRIDGE UNIV PRESS
Submitted on: 13 February 2006.
Revised on: 17 March 2006.
Accepted on: 13 April 2006.
___________________Annals of Actuarial Science---CAMBRIDGE UNIV PRESS
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