S. J. P. de Carvalho, V. Damin, A. C. R. Dias, G. M. Yamasaki, and P. J. Christoffoleti, “Efficacy and pH of glyphosate spray solutions after the addition of nitrogen fertilizers and the use of CO2-pressurized sprayer”, PAB, vol. 44, no. 6, pp. 569–575, Nov. 2010.