1. Verein Deutscher Ingenieure. VDI guideline 2221 – systematic approach to the development and design of technical systems and products. Düsseldorf: VDI; 1993.
2. Engineering design – a systematic approach;Pahl,2007
3. Verein Deutscher Ingenieure. VDI guideline 2206 – design methodology for mechatronic systems. Düsseldorf: VDI; 2004.
4. Methodische Entwicklung technischer Produkte;Lindemann,2009
5. Stoffels P, et al. Energy Engineering in the virtual factory. Proceedings of ETFA 2013. Cagliari; 2013.