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Submitted on: 07 August 2007.
Revised on: 19 September 2007.
Accepted on: 08 October 2007.
Theory and Applications of Categories
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Submitted on: 01 August 2007.
Revised on: 18 August 2007.
Accepted on: 27 August 2007.
Theory and Applications of Categories
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Submitted on: 17 March 2010.
Revised on: 12 April 2010.
Accepted on: 01 May 2010.
Theory and Applications of Categories
Submitted on: 06 March 2012.
Revised on: 06 April 2012.
Accepted on: 15 April 2012.
Theory and Applications of Categories
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