DUANPATRA, P.; KOAMTONG, L. Primary and residual Effects of Rock Phosphates and Their Correlation with P-Test Value of Rice Soil. Agriculture and Natural Resources, Bangkok, Thailand, v. 7, n. 2, p. 97–108, 1973. Disponível em: https://li01.tci-thaijo.org/index.php/anres/article/view/240655. Acesso em: 18 sep. 2026.