Submitted on: 23 December 2017.
Revised on: 22 March 2018.
Accepted on: 26 April 2018.
___________________Entertainment Computing---ELSEVIER SCI LTD
Submitted on: 21 June 2010.
Revised on: 24 July 2010.
Accepted on: 07 September 2010.
___________________Entertainment Computing---ELSEVIER SCI LTD
Submitted on: 25 December 2008.
Revised on: 27 January 2009.
Accepted on: 09 February 2009.
___________________Entertainment Computing---ELSEVIER SCI LTD
Submitted on: 11 April 1999.
Revised on: 17 May 1999.
Accepted on: 16 July 1999.
___________________Entertainment Computing---ELSEVIER SCI LTD
Submitted on: 13 May 2000.
Revised on: 27 June 2000.
Accepted on: 10 August 2000.
___________________Entertainment Computing---ELSEVIER SCI LTD
http://reply.papertrans.cn/1/86/8524/8524-36.png