Grace, John; Berninger, Frank; Nagy, Laszlo (2002). "Impacts of Climate Change on the Tree Line". Annals of Botany. 90 (4): 537–544. doi:10.1093/aob/mcf222. PMID12324278. fig. 1.
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Grace, John; Berninger, Frank; Nagy, Laszlo (2002). "Impacts of Climate Change on the Tree Line". Annals of Botany. 90 (4): 537–544. doi:10.1093/aob/mcf222. PMID12324278. fig. 1.