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Submitted on: 02 January 2004.
Revised on: 02 March 2004.
Accepted on: 11 April 2004.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
Submitted on: 10 June 2023.
Revised on: 07 August 2023.
Accepted on: 05 September 2023.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
Submitted on: 07 February 2016.
Revised on: 07 May 2016.
Accepted on: 07 June 2016.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
Submitted on: 19 February 2023.
Revised on: 13 June 2023.
Accepted on: 25 June 2023.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
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