1. Scoping study: Urban mobility in three cities;Ababa,2002
2. Urban public transport patterns in Nairobi, Kenya: A case study of Nairobi city;Aligula,2005
3. Competition between minibuses and regular bus services;Bly;Journal of Transport Economics and Policy,1986
4. Informal transport in the developing world;Cervero,2000
5. Informal transport: a global perspective;Cervero;Transport Policy,2007