Submitted on: 21 July 2018.
Revised on: 08 October 2018.
Accepted on: 27 October 2018.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
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Submitted on: 23 April 2020.
Revised on: 19 August 2020.
Accepted on: 02 September 2020.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
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Submitted on: 29 November 2013.
Revised on: 19 March 2014.
Accepted on: 15 May 2014.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
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Submitted on: 18 March 2001.
Revised on: 14 April 2001.
Accepted on: 26 May 2001.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC