WILLIAMS, M.; STREET, F.; DAKIN, F. Fossil Periglacial Deposits in the Semien Highlands, Ethiopia. ERDKUNDE, [S. l.], v. 32, n. 1, p. 40–46, 1978. DOI: 10.3112/erdkunde.1978.01.04. Disponível em: https://www.erdkunde.uni-bonn.de/article/view/1837. Acesso em: 17 may. 2025.