1. Jawahir IS. Beyond the 3R’s: 6R Concepts for Next Generation Manufacturing: Recent Trends and Case Studies. Symposium on Sustainability and Product Development IIT. Research Institute for Sustainability of Engineering, College of Engineering, Lexington, USA. 2008. pp. 1-110.
2. https://www.giz.de/expertise/downloads/Fachexpertise/en-maintenance-and-repair-module-1.pdf, 2017.
3. Lee J, Ni J, Djurdjanovic D, Qiu H, Liao H. Intelligent prognostics tools and e-maintenance. Computers in Industry. 2006;57:476-489
4. Jardine AKS, Lin D, Banjevic D. A review on machinery diagnostics and prognostics implementing condition-based maintenance. Mechanical Systems and Signal Processing. 2006;20:1483-1510
5. Okah-Avae BE. The Science of Industrial Machinery and Systems Maintenance. Ibadan: Spectrum Books Limited; 1995. pp. 19-28