Awadh, A.N.A., Lemme, D., Jira, T., Attef, O. and Al-rahwi, K. 2006. DETERMINATION OF PESTICIDE RESIDUES IN KHAT LEAVES BY SOLID-PHASE EXTRACTION AND HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY. African Journal of Traditional, Complementary and Alternative Medicines. 3, 1 (Jan. 2006), 1–10.