Submitted on: 04 March 2013.
Revised on: 14 March 2013.
Accepted on: 28 March 2013.
NULL
Submitted on: 18 March 1998.
Revised on: 18 April 1998.
Accepted on: 23 April 1998.
NULL
Submitted on: 31 December 2002.
Revised on: 09 February 2003.
Accepted on: 23 February 2003.
NULL
Submitted on: 20 October 2004.
Revised on: 19 November 2004.
Accepted on: 07 December 2004.
NULL
Submitted on: 02 October 2015.
Revised on: 25 October 2015.
Accepted on: 20 November 2015.
NULL
http://reply.papertrans.cn/3/244/24320/24320-16.png
http://reply.papertrans.cn/3/244/24320/24320-17.png
Submitted on: 12 February 2014.
Revised on: 06 March 2014.
Accepted on: 12 March 2014.
NULL
Submitted on: 24 September 2006.
Revised on: 18 October 2006.
Accepted on: 11 November 2006.
NULL
Submitted on: 07 January 2003.
Revised on: 03 February 2003.
Accepted on: 17 February 2003.
NULL