Submitted on: 19 September 2005.
Revised on: 06 November 2005.
Accepted on: 02 January 2006.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY
Submitted on: 23 December 2001.
Revised on: 19 March 2002.
Accepted on: 04 May 2002.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY
Submitted on: 17 July 2003.
Revised on: 10 October 2003.
Accepted on: 08 November 2003.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY
Submitted on: 30 June 2015.
Revised on: 30 September 2015.
Accepted on: 24 November 2015.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY
Submitted on: 02 February 2009.
Revised on: 25 April 2009.
Accepted on: 09 May 2009.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY
Submitted on: 06 November 2017.
Revised on: 10 January 2018.
Accepted on: 24 February 2018.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY
Submitted on: 13 February 2001.
Revised on: 12 March 2001.
Accepted on: 17 April 2001.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY
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Submitted on: 14 July 2012.
Revised on: 01 September 2012.
Accepted on: 18 October 2012.
___________________JOURNAL OF THE AUSTRALIAN MATHEMATICAL SOCIETY