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Geography and Natural Resources > 2016 > 37 > 4 > 313-318
Journal of Economics > 2010 > 100 > 3 > 191-216
Archiwum Ochrony Środowiska > 1998 > Vol. 24, no. 2 > 119-130
Geography and Natural Resources > 2016 > 37 > 4 > 313-318
Journal of Economics > 2010 > 100 > 3 > 191-216
Archiwum Ochrony Środowiska > 1998 > Vol. 24, no. 2 > 119-130