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Submitted on: 15 September 2017.
Revised on: 28 December 2017.
Accepted on: 26 January 2018.
___________________INFORMATION SYSTEMS FRONTIERS---SPRINGER
Submitted on: 24 September 2015.
Revised on: 25 December 2015.
Accepted on: 22 February 2016.
___________________INFORMATION SYSTEMS FRONTIERS---SPRINGER
Submitted on: 01 October 2017.
Revised on: 05 December 2017.
Accepted on: 03 January 2018.
___________________INFORMATION SYSTEMS FRONTIERS---SPRINGER
Submitted on: 11 December 2013.
Revised on: 17 February 2014.
Accepted on: 16 April 2014.
___________________INFORMATION SYSTEMS FRONTIERS---SPRINGER