Alcarde, J. C., R. A. Catani, and C. O. Ponchio. “ Colorimetric Determination of Copper in Fertilizers ”. Anais da Escola Superior de Agricultura Luiz de Queiroz 28 (January 1, 1971): 247–255. Accessed May 27, 2024. https://www.revistas.usp.br/aesalq/article/view/38954.