Submitted on: 14 May 1998.
Revised on: 04 June 1998.
Accepted on: 26 July 1998.
___________________INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
Submitted on: 07 December 2000.
Revised on: 09 February 2001.
Accepted on: 24 March 2001.
___________________INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
Submitted on: 31 July 2000.
Revised on: 04 October 2000.
Accepted on: 22 November 2000.
___________________INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
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