http://reply.papertrans.cn/1/33/3227/3227-11.png
Submitted on: 16 January 2008.
Revised on: 23 February 2008.
Accepted on: 16 March 2008.
___________________Azerbaijan Journal of Mathematics
Submitted on: 24 January 1999.
Revised on: 06 May 1999.
Accepted on: 24 June 1999.
___________________Azerbaijan Journal of Mathematics
http://reply.papertrans.cn/1/33/3227/3227-14.png
Submitted on: 02 April 2010.
Revised on: 31 May 2010.
Accepted on: 20 June 2010.
___________________Azerbaijan Journal of Mathematics
http://reply.papertrans.cn/1/33/3227/3227-16.png
http://reply.papertrans.cn/1/33/3227/3227-17.png
http://reply.papertrans.cn/1/33/3227/3227-18.png
Submitted on: 02 March 1999.
Revised on: 26 March 1999.
Accepted on: 20 April 1999.
___________________Azerbaijan Journal of Mathematics
Submitted on: 20 February 2017.
Revised on: 06 May 2017.
Accepted on: 27 June 2017.
___________________Azerbaijan Journal of Mathematics