Submitted on: 25 September 2011.
Revised on: 11 October 2011.
Accepted on: 27 October 2011.
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS
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Submitted on: 11 December 2021.
Revised on: 17 January 2022.
Accepted on: 14 February 2022.
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS
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