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Submitted on: 05 April 2002.
Revised on: 01 August 2002.
Accepted on: 15 September 2002.
___________________Journal of Pseudo-Differential Operators and Applications
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Submitted on: 27 August 2014.
Revised on: 20 December 2014.
Accepted on: 11 January 2015.
___________________Journal of Pseudo-Differential Operators and Applications
Submitted on: 31 January 2009.
Revised on: 11 May 2009.
Accepted on: 01 July 2009.
___________________Journal of Pseudo-Differential Operators and Applications