Submitted on: 14 May 2013.
Revised on: 07 June 2013.
Accepted on: 30 June 2013.
Mathematical and Computational Applications
http://reply.papertrans.cn/3/215/21422/21422-32.png
http://reply.papertrans.cn/3/215/21422/21422-33.png
Submitted on: 06 March 2018.
Revised on: 09 April 2018.
Accepted on: 22 April 2018.
Mathematical and Computational Applications
Submitted on: 24 June 2021.
Revised on: 07 July 2021.
Accepted on: 18 July 2021.
Mathematical and Computational Applications
http://reply.papertrans.cn/3/215/21422/21422-36.png