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Submitted on: 23 December 2013.
Revised on: 04 February 2014.
Accepted on: 20 February 2014.
Sahand Communications in Mathematical Analysis
Submitted on: 20 January 2005.
Revised on: 13 February 2005.
Accepted on: 11 March 2005.
Sahand Communications in Mathematical Analysis
http://reply.papertrans.cn/3/275/27449/27449-29.png
Submitted on: 30 January 2013.
Revised on: 08 February 2013.
Accepted on: 03 March 2013.
Sahand Communications in Mathematical Analysis