Submitted on: 03 December 2015.
Revised on: 20 February 2016.
Accepted on: 08 March 2016.
___________________Algebra and Logic---SPRINGER
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Submitted on: 03 February 2011.
Revised on: 28 May 2011.
Accepted on: 21 June 2011.
___________________Algebra and Logic---SPRINGER
Submitted on: 16 January 2004.
Revised on: 19 April 2004.
Accepted on: 11 May 2004.
___________________Algebra and Logic---SPRINGER
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Submitted on: 31 July 1999.
Revised on: 31 October 1999.
Accepted on: 12 November 1999.
___________________Algebra and Logic---SPRINGER
Submitted on: 09 March 2001.
Revised on: 27 April 2001.
Accepted on: 08 June 2001.
___________________Algebra and Logic---SPRINGER
Submitted on: 25 August 2005.
Revised on: 24 November 2005.
Accepted on: 18 January 2006.
___________________Algebra and Logic---SPRINGER
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