Submitted on: 10 October 2007.
Revised on: 16 November 2007.
Accepted on: 29 December 2007.
___________________Journal of Mathematical Fluid Mechanics
Submitted on: 20 April 2020.
Revised on: 07 June 2020.
Accepted on: 18 June 2020.
___________________Journal of Mathematical Fluid Mechanics
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