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Submitted on: 29 May 2002.
Revised on: 06 September 2002.
Accepted on: 04 November 2002.
___________________Journal of the Geographical Institute Jovan Cvijic SASA
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Submitted on: 15 January 2001.
Revised on: 24 April 2001.
Accepted on: 21 June 2001.
___________________Journal of the Geographical Institute Jovan Cvijic SASA
Submitted on: 01 April 2013.
Revised on: 29 May 2013.
Accepted on: 28 July 2013.
___________________Journal of the Geographical Institute Jovan Cvijic SASA