Santos, G. A., G. H. Korndorfer, H. S. Pereira, and W. Paye. “Addition of Micronutrients to Npk Formulation and Initial Development of Maize Plants”. Bioscience Journal, vol. 34, no. 4, Aug. 2018, pp. 927-36, doi:10.14393/BJ-v34n1a2018-36690.