Zondo, S. ., and P. . Mahlambi. “Comparison of Ultrasonic and QuEChERS Extraction Methods Efficiency for the Determination of Herbicides Residues in Soil and Maize Cob”. Trends in Sciences, vol. 19, no. 24, Nov. 2022, p. 3030, doi:10.48048/tis.2022.3030.