1. Miyamoto, K., Muzenda, D.: Mapping support for Africa’s infrastructure investment. (2012)
2. Collier, P., Kirchberger, M.: The Cost of Road Infrastructure in Low and Middle Income Countries. 1–27 (2015)
3. Mubila, M., Moolman, A., Van Zyl, W.: Study on road infrastructure costs: analysis of unit costs and cost overruns of road infrastructure projects in Africa. 40 (2014)
4. Consoli, N.C., Foppa, D., Festugato, L., Heineck, K.S.: Key parameters for strength control of artificially cemented soils. J. Geotech. Geoenvironmental Eng. 133, 197–205 (2007)
5. Ingles, O.G., Metcalf, J.: Soil Stabilization: Principles and Practice. Butterworth-Heinemann Ltd, Melbourne (1973)