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Submitted on: 16 December 2011.
Revised on: 19 January 2012.
Accepted on: 02 March 2012.
___________________Journal of Applied Analysis---WALTER DE GRUYTER GMBH
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Submitted on: 03 March 2021.
Revised on: 26 March 2021.
Accepted on: 17 April 2021.
___________________Journal of Applied Analysis---WALTER DE GRUYTER GMBH
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