Lu H, Yu J, Wu L, Xing J, Wang J, Huang P, Zhang J, Xiao H, Gao R. Optimized ultra performance liquid chromatography tandem high resolution mass spectrometry method for the quantification of paraquat in plasma and urine. J Chromatogr B Analyt Technol Biomed Life Sci. 2016 Aug 01; 1027:96-102.