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↑Remmert, Hermann. 1980. Arctic Animal Ecology. Berlin: Springer, p. 16.
↑DePasqual, Seth. 2012. Winning Coal at 78° North: Mining, Contingency and the Chaîne Opératoire in Old Longyear City. In: Louwrens Hacquebord (ed.), Lashipa: History of Large Scale Resource Exploitation in Polar Areras, pp. 71–82. Groningen: University of Groningen, p. 75.