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Submitted on: 09 May 2016.
Revised on: 21 July 2016.
Accepted on: 30 August 2016.
___________________Journal of Nonlinear and Variational Analysis
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Submitted on: 18 June 2004.
Revised on: 07 August 2004.
Accepted on: 19 August 2004.
___________________Journal of Nonlinear and Variational Analysis
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Submitted on: 23 February 2010.
Revised on: 04 May 2010.
Accepted on: 17 May 2010.
___________________Journal of Nonlinear and Variational Analysis
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