LAUER, W. Carl Troll - Naturforscher und Geograph. ERDKUNDE, [S. l.], v. 30, n. 1, p. 1–9, 1976. DOI: 10.3112/erdkunde.1976.01.01. Disponível em: https://www.erdkunde.uni-bonn.de/article/view/1769. Acesso em: 16 may. 2024.