1. Socio economic aspects of khat in the Harrarghe Administrative Region (Ethiopia);Assefa,1983
2. Merucathine, a new phenyl-alkylamine from Catha edulis;Brenneisen;Planta medica,1984
3. Analytical and chemical aspects of Catha edulis Forsk;Brenneisen;Pharmaceutica Acta Helvetiae,1985
4. The pharmacology of khat;Kalix;General Pharmacology,1984
5. Pharmacological aspects of the chewing of khat leaves;Kalix;Pharmacological Reviews,1985