1. "Drug dumping" in donations to Sudan;Ali;Lancet,1988
2. Inland stability study (Sudan);Hogerzeil,1991
3. Potency of ergometrine in tropical countries;Walker;Lancet,1988
4. Stability of drugs in the tropics. a study in Sudan;Abu-Reid;Int Pharm J,1990
5. WHO/UNICEF study on stability of drugs during international transport;Hogerzeil,1991