Frazão, J. J., A. R. Silva, F. H. M. Salgado, R. A. Flores, e E. P. F. Brasil. 2020. “Yield and Chlorophyll Index in Cabbage in Function of Enhanced-Efficiency Nitrogen Fertilizers and Urea”. Scientific Electronic Archives 13 (2):6-12. https://doi.org/10.36560/1312020997.