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Submitted on: 26 December 2007.
Revised on: 25 March 2008.
Accepted on: 01 May 2008.
___________________JOURNAL OF DATABASE MANAGEMENT
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Submitted on: 13 October 2018.
Revised on: 04 February 2019.
Accepted on: 02 March 2019.
___________________JOURNAL OF DATABASE MANAGEMENT
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