Helkiær Jensen, R. (1982) “Carl Troll & W. Lauer (hrsg): Geoecological relations between the southern temperate zone and the tropical mountains”., Geografisk Tidsskrift - Danish Journal of Geography, 82. Available at: https://tidsskrift.dk/geografisktidsskrift/article/view/46072 (Accessed: 5 December 2025).