1. https://www.who.int/news-room/fact-sheets/detail/road-traffic-injuries.
2. Bayarjargal Tseveennamjil, Anton Hudák, Vladimír Rievaj 155–163(2011).
3. Kroning, Achim Wang, Hui Goer, Peter Straznikiewiecz, Dariusz “Bumper” (United States Patent 2001).
4. Frank Mooijman, Dominic Mc Mahon, Srikanth M., Santhanam (United States Patent 2006).
5. Bingyu Wang, Jikuang Yang, Dietmar Otte (Eighth International Conference on Measuring Technology and Mechatronics Automation, Germany, 768–772, 2016.