Submitted on: 19 January 2024.
Revised on: 18 April 2024.
Accepted on: 01 June 2024.
___________________CONSTRAINTS---SPRINGER
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Submitted on: 26 November 2012.
Revised on: 22 February 2013.
Accepted on: 09 March 2013.
___________________CONSTRAINTS---SPRINGER
Submitted on: 14 October 2019.
Revised on: 15 January 2020.
Accepted on: 06 February 2020.
___________________CONSTRAINTS---SPRINGER
Submitted on: 07 January 2011.
Revised on: 06 March 2011.
Accepted on: 03 May 2011.
___________________CONSTRAINTS---SPRINGER
Submitted on: 05 April 1998.
Revised on: 27 July 1998.
Accepted on: 19 September 1998.
___________________CONSTRAINTS---SPRINGER
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http://reply.papertrans.cn/1/64/6393/6393-18.png
http://reply.papertrans.cn/1/64/6393/6393-19.png
Submitted on: 24 October 2001.
Revised on: 15 December 2001.
Accepted on: 22 January 2002.
___________________CONSTRAINTS---SPRINGER