Submitted on: 12 September 2000.
Revised on: 02 October 2000.
Accepted on: 16 October 2000.
JOURNAL OF UNIVERSAL COMPUTER SCIENCE
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Submitted on: 08 February 2007.
Revised on: 15 March 2007.
Accepted on: 29 March 2007.
JOURNAL OF UNIVERSAL COMPUTER SCIENCE
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Submitted on: 01 August 2004.
Revised on: 13 September 2004.
Accepted on: 22 September 2004.
JOURNAL OF UNIVERSAL COMPUTER SCIENCE