Kruuk, H. (2014). Otters and eels: Long-term observations on declines in Scotland. IUCN/SCC Otter Specialist Group Bulletin, 31(1), 3–11. – Otterland https://www.otterland.info/neuigkeiten/literaturdatenbank/kruuk-h-2014-otters-and-eels-long-term-observations-on-declines-in-scotland-iucn-scc-otter-specialist-group-bulletin-311-3-11/
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