Schweinfurth, Ulrich. “Symposium on Tropical Botany, University of Aarhus, 10. - 12. August 1978”. ERDKUNDE 32, no. 4 (December 31, 1977): 299–300. Accessed October 7, 2024. https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1860.