Submitted on: 22 July 2014.
Revised on: 02 September 2014.
Accepted on: 16 September 2014.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
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Submitted on: 12 June 2001.
Revised on: 04 July 2001.
Accepted on: 30 July 2001.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
http://reply.papertrans.cn/3/254/25348/25348-25.png
Submitted on: 25 November 2008.
Revised on: 04 December 2008.
Accepted on: 30 December 2008.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
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Submitted on: 13 September 2009.
Revised on: 10 October 2009.
Accepted on: 19 October 2009.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Submitted on: 03 December 2009.
Revised on: 11 December 2009.
Accepted on: 25 December 2009.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES