Submitted on: 07 September 2009.
Revised on: 11 December 2009.
Accepted on: 24 January 2010.
___________________COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS
Submitted on: 01 August 2004.
Revised on: 31 August 2004.
Accepted on: 19 September 2004.
___________________COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS
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Submitted on: 24 December 1999.
Revised on: 27 March 2000.
Accepted on: 03 May 2000.
___________________COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS