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Westrin, Theodor, ed. (1910). "Idun". Nordisk familjebok (in Swedish). Stockholm. pp. 369–370. Archived from the original on 20 March 2022. Retrieved 20 March 2022.{{cite book}}: CS1 maint: location missing publisher (link)
"On Swedish and Scandinavian Heritage", The Nobel Prize in Medicine and the Karolinska Institute, Basel: KARGER, pp. 41–54, archived from the original on 1 May 2019, retrieved 2 April 2022