Mantovani, J. R.; Cruz, M. C. P. da; Ferreira, M. E.; Barbosa, J. C. Comparison of Procedures for Nitrate Determination in Vegetable Tissue. PAB 2005, 40 (1), 53-59. https://doi.org/10.1590/S1678-3921.pab2005.v40.6921.