Submitted on: 31 March 1998.
Revised on: 07 May 1998.
Accepted on: 13 May 1998.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY
Submitted on: 10 July 2005.
Revised on: 26 July 2005.
Accepted on: 07 August 2005.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY
Submitted on: 27 July 2019.
Revised on: 30 August 2019.
Accepted on: 09 September 2019.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY
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http://reply.papertrans.cn/3/253/25277/25277-15.png
Submitted on: 27 January 2001.
Revised on: 26 February 2001.
Accepted on: 19 March 2001.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY
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Submitted on: 24 April 2017.
Revised on: 01 June 2017.
Accepted on: 29 June 2017.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY
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Submitted on: 21 October 2012.
Revised on: 24 November 2012.
Accepted on: 07 December 2012.
PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY