1. http://www.eliica.com/
2. http://www.gm.com/company/gmability/adv_tech/600_tt/650_future/autonomy_050103.html
3. http://www.toyota.co.jp/en/news/05/1011_1.html
4. Influence of unsprung weight on vehicle ride quality
5. Liu, W., Automotive Design, Tsinghua University Press, 2001.