Miehe, G. and Miehe, S. 2000. 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. 54, 1 (Mar. 2000), 34–50. DOI:https://doi.org/10.3112/erdkunde.2000.01.03.