标题:The Vegetation Types of Northeast Greenland: A Phytosociological Study Based Mainly on Material Left by Th. Sørensen from the 1931–1935 Expeditions. Meddelelser om Grønland, Bioscience 49, Under Polaris: An Arctic Quest, Protecting the Arctic: Indigenous Peoples and Cultural Survival, Voyage of the Belgica : Fifteen Months in the Antarctic