http://reply.papertrans.cn/2/138/13727/13727-11.png
Submitted on: 14 September 2013.
Revised on: 08 October 2013.
Accepted on: 23 October 2013.
___________________International Journal of Mathematics and Physics
http://reply.papertrans.cn/2/138/13727/13727-13.png
http://reply.papertrans.cn/2/138/13727/13727-14.png
http://reply.papertrans.cn/2/138/13727/13727-15.png
http://reply.papertrans.cn/2/138/13727/13727-16.png
http://reply.papertrans.cn/2/138/13727/13727-17.png
http://reply.papertrans.cn/2/138/13727/13727-18.png
Submitted on: 28 April 2010.
Revised on: 20 July 2010.
Accepted on: 17 August 2010.
___________________International Journal of Mathematics and Physics
http://reply.papertrans.cn/2/138/13727/13727-20.png