Miehe, G., and S. Miehe. “Comparative High Mountain Research on the Treeline Ecotone under Human Impact Carl Troll’s Asymmetrical Zonation of the Humid Vegetation Types of the World of 1948 Reconsidered: Carl Troll’s ‘Asymmetrical Zonation of the Humid Vegetation Types of the World’ of 1948 Reconsidered”. ERDKUNDE, vol. 54, no. 1, Mar. 2000, pp. 34-50, doi:10.3112/erdkunde.2000.01.03.