1. Mitodepressive effect of (−)-cathinone, from Catha edulis (khat), on the meristematic region of Allium cepa root tips
2. , , and (1984). Studies on the endocrine disturbances induced by chronic khat (Catha edulis) administration in albino rats. Proceedings of the International Society on Toxicology, European Section 1984, p. 2.
3. and (1983). The epidemiology of khat chewing in the Republic of Djibouti. WHO Document EM/MENT/102.
4. and (Eds) (1982). Textbook of Pharmacology, 2nd Ed. p. 20.2, Blackwell Scientific Publications, London.