Submitted on: 10 April 2006.
Revised on: 10 May 2006.
Accepted on: 20 May 2006.
___________________Journal of Differential Equations
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Submitted on: 24 June 2003.
Revised on: 09 October 2003.
Accepted on: 24 October 2003.
___________________Journal of Differential Equations
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Submitted on: 08 November 2009.
Revised on: 12 December 2009.
Accepted on: 20 January 2010.
___________________Journal of Differential Equations