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Submitted on: 27 November 2019.
Revised on: 09 January 2020.
Accepted on: 22 January 2020.
___________________IEEE SPECTRUM---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Submitted on: 21 April 1999.
Revised on: 30 June 1999.
Accepted on: 02 August 1999.
___________________IEEE SPECTRUM---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Submitted on: 11 September 2003.
Revised on: 08 December 2003.
Accepted on: 31 December 2003.
___________________IEEE SPECTRUM---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC