Submitted on: 19 August 2001.
Revised on: 18 November 2001.
Accepted on: 21 December 2001.
___________________ANTARCTIC SCIENCE---CAMBRIDGE UNIV PRESS
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Submitted on: 20 October 1998.
Revised on: 11 February 1999.
Accepted on: 23 February 1999.
___________________ANTARCTIC SCIENCE---CAMBRIDGE UNIV PRESS
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Submitted on: 25 February 2014.
Revised on: 27 March 2014.
Accepted on: 16 April 2014.
___________________ANTARCTIC SCIENCE---CAMBRIDGE UNIV PRESS
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Submitted on: 16 April 1998.
Revised on: 21 May 1998.
Accepted on: 26 June 1998.
___________________ANTARCTIC SCIENCE---CAMBRIDGE UNIV PRESS
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