Submitted on: 13 May 2014.
Revised on: 15 June 2014.
Accepted on: 31 July 2014.
___________________IMA Journal of Management Mathematics
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Submitted on: 19 June 2016.
Revised on: 02 October 2016.
Accepted on: 24 November 2016.
___________________IMA Journal of Management Mathematics
Submitted on: 04 March 2010.
Revised on: 22 June 2010.
Accepted on: 12 July 2010.
___________________IMA Journal of Management Mathematics
Submitted on: 30 April 2016.
Revised on: 14 June 2016.
Accepted on: 25 June 2016.
___________________IMA Journal of Management Mathematics
Submitted on: 11 October 2014.
Revised on: 26 December 2014.
Accepted on: 15 February 2015.
___________________IMA Journal of Management Mathematics
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Submitted on: 23 May 2004.
Revised on: 22 July 2004.
Accepted on: 03 September 2004.
___________________IMA Journal of Management Mathematics