MENA, Hernán David; CASTILLO, Jesús Antonio; MARÍN, Jaime Andrés. Calibration preliminary results of a portable kit for soil chemical analysis. Revista de Ciencias Agrícolas, [S. l.], v. 30, n. 1, p. 79–86, 2013. Disponível em: https://revistas.udenar.edu.co/index.php/rfacia/article/view/971. Acesso em: 3 apr. 2025.