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Permafrost thermal state in the polar northern hemisphere during the International Polar Year 2007 - 2009: a Synthesis;
Romanovsky, V E; Smith, S L; Christiansen, H H. Permafrost and Periglacial Processes vol. 21, no. 2, 2010 p. 106-116,
https://doi.org/10.1002/ppp.689 
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Cont.# 20100028)