Submitted on: 23 August 1999.
Revised on: 30 September 1999.
Accepted on: 09 October 1999.
QUANTUM INFORMATION & COMPUTATION
Submitted on: 28 February 2001.
Revised on: 12 March 2001.
Accepted on: 20 March 2001.
QUANTUM INFORMATION & COMPUTATION
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Submitted on: 22 February 2006.
Revised on: 01 April 2006.
Accepted on: 12 April 2006.
QUANTUM INFORMATION & COMPUTATION