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Citace podle Chicago (17th ed.)SpringerLink (Online service) a Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Dordrecht: Springer Netherlands, 2011.
Citace podle MLA (9th ed.)SpringerLink (Online service) a Georgi Zhelezov. Sustainable Development in Mountain Regions: Southeastern Europe. Springer Netherlands, 2011.
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