Al-Motarreb, A. L.; Broadley, K. J. (October–December 2003). "Coronary and aortic vasoconstriction by cathinone, the active constituent of khat". Autonomic & Autacoid Pharmacology. 23 (5–6): 319–26. doi:10.1111/j.1474-8673.2004.00303.x. PMID15255816.
Al-Motarreb, A. L.; Broadley, K. J. (October–December 2003). "Coronary and aortic vasoconstriction by cathinone, the active constituent of khat". Autonomic & Autacoid Pharmacology. 23 (5–6): 319–26. doi:10.1111/j.1474-8673.2004.00303.x. PMID15255816.