NICHOLSON, S. E. Statistical Typing of rainfall anomalies in subsaharan Africa. ERDKUNDE, [S. l.], v. 33, n. 2, p. 95–103, 1979. DOI: 10.3112/erdkunde.1979.02.02. Disponível em: https://www.erdkunde.uni-bonn.de/article/view/1871. Acesso em: 30 apr. 2025.