Submitted on: 28 April 2007.
Revised on: 21 June 2007.
Accepted on: 18 August 2007.
___________________Anales del Instituto de Actuarios Espanoles
Submitted on: 20 February 2006.
Revised on: 04 June 2006.
Accepted on: 20 July 2006.
___________________Anales del Instituto de Actuarios Espanoles
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Submitted on: 02 April 2002.
Revised on: 03 July 2002.
Accepted on: 21 August 2002.
___________________Anales del Instituto de Actuarios Espanoles
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Submitted on: 16 December 2014.
Revised on: 21 March 2015.
Accepted on: 21 April 2015.
___________________Anales del Instituto de Actuarios Espanoles
Submitted on: 19 November 2000.
Revised on: 21 February 2001.
Accepted on: 04 April 2001.
___________________Anales del Instituto de Actuarios Espanoles