BYJU, G.; VARGHESE, Thomas. Soil acidity parameters of laterite soils under rubber. Journal of Tropical Agriculture, [S. l.], v. 39, n. 2, p. 120–123, 2006. Disponível em: https://jtropag.kau.in/index.php/ojs2/article/view/37. Acesso em: 5 may. 2024.