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Submitted on: 09 December 1999.
Revised on: 09 February 2000.
Accepted on: 26 February 2000.
___________________JOURNAL OF SUPERCOMPUTING---SPRINGER
Submitted on: 07 July 2017.
Revised on: 06 August 2017.
Accepted on: 01 September 2017.
___________________JOURNAL OF SUPERCOMPUTING---SPRINGER
Submitted on: 09 March 2019.
Revised on: 03 May 2019.
Accepted on: 15 May 2019.
___________________JOURNAL OF SUPERCOMPUTING---SPRINGER
Submitted on: 21 May 2019.
Revised on: 28 August 2019.
Accepted on: 27 October 2019.
___________________JOURNAL OF SUPERCOMPUTING---SPRINGER
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