http://reply.papertrans.cn/2/123/12243/12243-31.png
Submitted on: 29 October 2018.
Revised on: 31 December 2018.
Accepted on: 11 February 2019.
___________________IMA Journal of Management Mathematics
http://reply.papertrans.cn/2/123/12243/12243-33.png
Submitted on: 01 February 2015.
Revised on: 19 March 2015.
Accepted on: 14 April 2015.
___________________IMA Journal of Management Mathematics
http://reply.papertrans.cn/2/123/12243/12243-35.png
Submitted on: 31 August 2021.
Revised on: 03 December 2021.
Accepted on: 20 January 2022.
___________________IMA Journal of Management Mathematics