Submitted on: 12 July 1999.
Revised on: 17 August 1999.
Accepted on: 08 October 1999.
___________________Advances in Operator Theory---SPRINGER BASEL AG
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Submitted on: 01 May 2010.
Revised on: 03 June 2010.
Accepted on: 14 June 2010.
___________________Advances in Operator Theory---SPRINGER BASEL AG
Submitted on: 14 February 2004.
Revised on: 08 March 2004.
Accepted on: 12 April 2004.
___________________Advances in Operator Theory---SPRINGER BASEL AG
Submitted on: 06 November 2010.
Revised on: 21 January 2011.
Accepted on: 01 February 2011.
___________________Advances in Operator Theory---SPRINGER BASEL AG
Submitted on: 30 July 2011.
Revised on: 19 November 2011.
Accepted on: 10 December 2011.
___________________Advances in Operator Theory---SPRINGER BASEL AG
Submitted on: 28 February 2010.
Revised on: 21 May 2010.
Accepted on: 08 June 2010.
___________________Advances in Operator Theory---SPRINGER BASEL AG
Submitted on: 25 September 2008.
Revised on: 26 November 2008.
Accepted on: 19 January 2009.
___________________Advances in Operator Theory---SPRINGER BASEL AG