Submitted on: 18 November 2015.
Revised on: 17 February 2016.
Accepted on: 02 April 2016.
___________________Formath---FORMATH RESEARCH GROUP
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http://reply.papertrans.cn/2/101/10040/10040-13.png
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Submitted on: 01 March 2022.
Revised on: 06 April 2022.
Accepted on: 22 May 2022.
___________________Formath---FORMATH RESEARCH GROUP
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Submitted on: 18 March 2010.
Revised on: 19 April 2010.
Accepted on: 25 May 2010.
___________________Formath---FORMATH RESEARCH GROUP
Submitted on: 11 January 1999.
Revised on: 25 February 1999.
Accepted on: 09 April 1999.
___________________Formath---FORMATH RESEARCH GROUP