Submitted on: 29 June 2011.
Revised on: 14 July 2011.
Accepted on: 31 July 2011.
Smart Science---TAYLOR & FRANCIS LTD
http://reply.papertrans.cn/3/281/28085/28085-32.png
Submitted on: 26 February 2019.
Revised on: 11 April 2019.
Accepted on: 30 April 2019.
NULL
http://reply.papertrans.cn/3/281/28085/28085-34.png
http://reply.papertrans.cn/3/281/28085/28085-35.png
Submitted on: 14 January 1999.
Revised on: 23 February 1999.
Accepted on: 03 March 1999.
Smart Science---TAYLOR & FRANCIS LTD