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Submitted on: 17 December 2012.
Revised on: 23 February 2013.
Accepted on: 13 April 2013.
___________________ADVANCED NONLINEAR STUDIES---DE GRUYTER POLAND SP Z O O
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Submitted on: 24 October 1998.
Revised on: 17 January 1999.
Accepted on: 28 January 1999.
___________________ADVANCED NONLINEAR STUDIES---DE GRUYTER POLAND SP Z O O
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Submitted on: 03 January 2025.
Revised on: 19 February 2025.
Accepted on: 18 March 2025.
___________________ADVANCED NONLINEAR STUDIES---DE GRUYTER POLAND SP Z O O
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