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Submitted on: 20 October 2019.
Revised on: 29 January 2020.
Accepted on: 11 February 2020.
___________________Folia Geographica---UNIV PRESOV
Submitted on: 19 June 2009.
Revised on: 07 October 2009.
Accepted on: 31 October 2009.
___________________Folia Geographica---UNIV PRESOV
Submitted on: 01 February 2005.
Revised on: 09 April 2005.
Accepted on: 17 May 2005.
___________________Folia Geographica---UNIV PRESOV