Submitted on: 15 March 2011.
Revised on: 02 July 2011.
Accepted on: 19 July 2011.
___________________Journal of Nonlinear Functional Analysis
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Submitted on: 24 February 1999.
Revised on: 17 April 1999.
Accepted on: 18 May 1999.
___________________Journal of Nonlinear Functional Analysis
Submitted on: 27 April 2012.
Revised on: 16 August 2012.
Accepted on: 25 September 2012.
___________________Journal of Nonlinear Functional Analysis
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Submitted on: 04 September 2005.
Revised on: 16 October 2005.
Accepted on: 22 November 2005.
___________________Journal of Nonlinear Functional Analysis
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