• https://fhs.brage.unit.no/fhs-xmlui/handle/11250/3069262
• https://fhs.brage.unit.no/fhs-xmlui/handle/11250/160881
• https://fhs.brage.unit.no/fhs-xmlui/handle/11250/2670778
• https://fhs.brage.unit.no/fhs-xmlui/handle/11250/2585034