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Submitted on: 04 June 2017.
Revised on: 27 June 2017.
Accepted on: 19 July 2017.
PROCEEDINGS OF THE ROYAL SOCIETY OF EDINBURGH SECTION A-MATHEMATICS
Submitted on: 22 December 2011.
Revised on: 21 January 2012.
Accepted on: 12 February 2012.
PROCEEDINGS OF THE ROYAL SOCIETY OF EDINBURGH SECTION A-MATHEMATICS
Submitted on: 27 August 2021.
Revised on: 19 September 2021.
Accepted on: 12 October 2021.
PROCEEDINGS OF THE ROYAL SOCIETY OF EDINBURGH SECTION A-MATHEMATICS
Submitted on: 08 November 2002.
Revised on: 29 November 2002.
Accepted on: 04 December 2002.
PROCEEDINGS OF THE ROYAL SOCIETY OF EDINBURGH SECTION A-MATHEMATICS
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