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Submitted on: 19 January 2011.
Revised on: 27 April 2011.
Accepted on: 27 May 2011.
___________________Journal of Mathematical Fluid Mechanics
Submitted on: 28 December 2009.
Revised on: 06 March 2010.
Accepted on: 06 April 2010.
___________________Journal of Mathematical Fluid Mechanics
Submitted on: 16 September 2003.
Revised on: 15 December 2003.
Accepted on: 11 February 2004.
___________________Journal of Mathematical Fluid Mechanics
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Submitted on: 02 December 2000.
Revised on: 30 December 2000.
Accepted on: 19 February 2001.
___________________Journal of Mathematical Fluid Mechanics
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