Submitted on: 02 January 2001.
Revised on: 12 February 2001.
Accepted on: 27 March 2001.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
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Submitted on: 29 September 2005.
Revised on: 22 October 2005.
Accepted on: 01 December 2005.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
Submitted on: 04 April 2001.
Revised on: 27 June 2001.
Accepted on: 15 August 2001.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC
Submitted on: 16 April 2009.
Revised on: 23 May 2009.
Accepted on: 08 July 2009.
___________________E & M Ekonomie a Management---TECHNICAL UNIV LIBEREC