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Submitted on: 19 January 2004.
Revised on: 21 February 2004.
Accepted on: 09 March 2004.
___________________JOURNAL OF CLASSIFICATION---SPRINGER
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Submitted on: 07 August 2000.
Revised on: 21 November 2000.
Accepted on: 04 December 2000.
___________________JOURNAL OF CLASSIFICATION---SPRINGER
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Submitted on: 03 October 2003.
Revised on: 23 December 2003.
Accepted on: 10 February 2004.
___________________JOURNAL OF CLASSIFICATION---SPRINGER
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