Submitted on: 19 April 2004.
Revised on: 11 August 2004.
Accepted on: 02 September 2004.
___________________ARCHIVE FOR MATHEMATICAL LOGIC
Submitted on: 01 April 2002.
Revised on: 13 July 2002.
Accepted on: 17 August 2002.
___________________ARCHIVE FOR MATHEMATICAL LOGIC
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Submitted on: 05 August 2004.
Revised on: 17 September 2004.
Accepted on: 09 November 2004.
___________________ARCHIVE FOR MATHEMATICAL LOGIC
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Submitted on: 18 January 2000.
Revised on: 04 March 2000.
Accepted on: 04 April 2000.
___________________ARCHIVE FOR MATHEMATICAL LOGIC