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Submitted on: 04 December 2000.
Revised on: 19 December 2000.
Accepted on: 25 December 2000.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
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http://reply.papertrans.cn/3/254/25348/25348-34.png
Submitted on: 11 February 2022.
Revised on: 28 February 2022.
Accepted on: 22 March 2022.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Submitted on: 18 July 2004.
Revised on: 31 July 2004.
Accepted on: 26 August 2004.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES