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Submitted on: 07 March 1999.
Revised on: 03 June 1999.
Accepted on: 28 July 1999.
___________________Journal of Applied Analysis---WALTER DE GRUYTER GMBH
Submitted on: 19 June 2012.
Revised on: 18 August 2012.
Accepted on: 13 October 2012.
___________________Journal of Applied Analysis---WALTER DE GRUYTER GMBH
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Submitted on: 08 May 2013.
Revised on: 27 August 2013.
Accepted on: 10 October 2013.
___________________Journal of Applied Analysis---WALTER DE GRUYTER GMBH
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Submitted on: 19 October 2014.
Revised on: 08 November 2014.
Accepted on: 27 December 2014.
___________________Journal of Applied Analysis---WALTER DE GRUYTER GMBH