http://reply.papertrans.cn/1/64/6340/6340-11.png
http://reply.papertrans.cn/1/64/6340/6340-12.png
Submitted on: 22 February 2007.
Revised on: 10 May 2007.
Accepted on: 26 May 2007.
___________________Concrete Operators---DE GRUYTER POLAND SP Z O O
Submitted on: 18 September 2022.
Revised on: 04 December 2022.
Accepted on: 02 February 2023.
___________________Concrete Operators---DE GRUYTER POLAND SP Z O O
http://reply.papertrans.cn/1/64/6340/6340-15.png
Submitted on: 06 August 2003.
Revised on: 01 November 2003.
Accepted on: 18 November 2003.
___________________Concrete Operators---DE GRUYTER POLAND SP Z O O
http://reply.papertrans.cn/1/64/6340/6340-17.png
http://reply.papertrans.cn/1/64/6340/6340-18.png
http://reply.papertrans.cn/1/64/6340/6340-19.png
http://reply.papertrans.cn/1/64/6340/6340-20.png