KALVIG, P.; FOLD, N.; JØNSSON, J. B.; ELISAIMON MSHIU, E. . Rock phosphate and lime for small-scale farming in Tanzania, East Africa. GEUS Bulletin, Copenhagen, Denmark, v. 26, p. 85–88, 2012. DOI: 10.34194/geusb.v26.4772. Disponível em: https://geusbulletin.org/index.php/geusb/article/view/4772. Acesso em: 30 jun. 2022.