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Submitted on: 23 October 2004.
Revised on: 22 November 2004.
Accepted on: 10 December 2004.
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS
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Submitted on: 13 October 2017.
Revised on: 05 November 2017.
Accepted on: 18 November 2017.
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS
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