GACHARI, Francis; MULATI, David M.; MUTUKU, Joseph N. Sunspot numbers: Implications on Eastern African rainfall. South African Journal of Science, [S. l.], v. 110, n. 1/2, p. 1–5, 2014. DOI: 10.1590/sajs.2014/20130050. Disponível em: https://sajs.co.za/article/view/3636. Acesso em: 2 may. 2024.