Submitted on: 23 February 1998.
Revised on: 22 March 1998.
Accepted on: 03 April 1998.
NULL
http://reply.papertrans.cn/3/209/20898/20898-32.png
Submitted on: 16 January 2020.
Revised on: 29 February 2020.
Accepted on: 26 March 2020.
NULL
Submitted on: 07 April 2010.
Revised on: 06 May 2010.
Accepted on: 26 May 2010.
NULL
http://reply.papertrans.cn/3/209/20898/20898-35.png
Submitted on: 29 November 2016.
Revised on: 09 December 2016.
Accepted on: 06 January 2017.
NULL