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Submitted on: 29 January 2013.
Revised on: 07 May 2013.
Accepted on: 26 June 2013.
___________________IT-Information Technology---WALTER DE GRUYTER GMBH
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Submitted on: 25 October 2014.
Revised on: 17 December 2014.
Accepted on: 16 January 2015.
___________________IT-Information Technology---WALTER DE GRUYTER GMBH
Submitted on: 28 May 2018.
Revised on: 04 August 2018.
Accepted on: 25 September 2018.
___________________IT-Information Technology---WALTER DE GRUYTER GMBH
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Submitted on: 10 October 2022.
Revised on: 29 December 2022.
Accepted on: 17 February 2023.
___________________IT-Information Technology---WALTER DE GRUYTER GMBH
Submitted on: 29 April 2003.
Revised on: 03 July 2003.
Accepted on: 27 August 2003.
___________________IT-Information Technology---WALTER DE GRUYTER GMBH
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