Elbashir, D. A. and Ahmed, H. E. (2013) “Gas Chromatography-Mass Spectrometer Electron Ionization (GC-MS -EI)method for the Analysis of MalathionResidue in Tomato”, JOURNAL OF ADVANCES IN CHEMISTRY, 2(1), pp. 73–81. doi: 10.24297/jac.v2i1.911.