Alnedhary, Anass A., Mahfoudh M. AL-Hammadi, Abdualqawi A. Numan, and Fatima A. Murshed. 2020. “Optimization and Efficiency Comparison of Dispersive and Cartridge Solid Phase Extraction Cleanup Techniques in the Analysis of Pesticide Residues in Some Vegetables Using Gas Chromatography-Mass Spectrometry”. PSM Biological Research 5 (1):40-54. https://psmjournals.org/index.php/biolres/article/view/393.