Submitted on: 19 June 2019.
Revised on: 10 August 2019.
Accepted on: 28 August 2019.
___________________IMA Journal of Management Mathematics
http://reply.papertrans.cn/2/123/12242/12242-32.png
Submitted on: 09 February 2012.
Revised on: 31 May 2012.
Accepted on: 18 July 2012.
___________________IMA Journal of Management Mathematics
Submitted on: 18 October 2010.
Revised on: 14 December 2010.
Accepted on: 20 January 2011.
___________________IMA Journal of Management Mathematics
Submitted on: 23 March 2013.
Revised on: 17 July 2013.
Accepted on: 04 September 2013.
___________________IMA Journal of Management Mathematics
http://reply.papertrans.cn/2/123/12242/12242-36.png