http://reply.papertrans.cn/2/164/16330/16330-21.png
Submitted on: 30 December 2002.
Revised on: 20 January 2003.
Accepted on: 23 February 2003.
___________________JOURNAL OF DIFFERENCE EQUATIONS AND APPLICATIONS
Submitted on: 29 January 2009.
Revised on: 08 March 2009.
Accepted on: 20 April 2009.
___________________JOURNAL OF DIFFERENCE EQUATIONS AND APPLICATIONS
http://reply.papertrans.cn/2/164/16330/16330-24.png
Submitted on: 31 July 1998.
Revised on: 28 October 1998.
Accepted on: 17 December 1998.
___________________JOURNAL OF DIFFERENCE EQUATIONS AND APPLICATIONS
Submitted on: 13 April 2006.
Revised on: 10 May 2006.
Accepted on: 05 July 2006.
___________________JOURNAL OF DIFFERENCE EQUATIONS AND APPLICATIONS
Submitted on: 08 February 2010.
Revised on: 09 April 2010.
Accepted on: 29 April 2010.
___________________JOURNAL OF DIFFERENCE EQUATIONS AND APPLICATIONS
http://reply.papertrans.cn/2/164/16330/16330-28.png
http://reply.papertrans.cn/2/164/16330/16330-29.png
Submitted on: 29 February 2016.
Revised on: 12 April 2016.
Accepted on: 07 May 2016.
___________________JOURNAL OF DIFFERENCE EQUATIONS AND APPLICATIONS