JUNSUPASEN, S.; AMORNSAWATWATTANA, I.; PANPEAN, C. . Soil pH and Nutrient Analyzer for Selecting Suitable Economic Crops. RMUTL Engineering Journal, [S. l.], v. 9, n. 2, p. 30–40, 2024. DOI: 10.14456/rmutlengj.2024.12. Disponível em: https://ph01.tci-thaijo.org/index.php/RMUTLEngJ/article/view/254142. Acesso em: 10 dec. 2025.