1. 1. Aerial refueling. (2003, May 31). Wikipedia. https://en.wikipedia.org/wiki/Aerial_refueling
2. 2. W. Alyafie, “Automatic Door System of Bus Door,” 2012. [Online]. Available: https://www.slideshare.net/WaleedAlyafie/automatic-door-of-bus-door.
3. 3. B. Baykus, E. Anli, and I. Ozkol, “Design and Kinematics Analysis of a Parallel Mechanism to be Utilized as a Luggage Door by an Analogy to a Four-Bar Mechanism,” vol. 2011, no. April, pp. 411–421, 2011.
4. 4. N. D. Thang, “Mechanism.” [Online]. Available: https://www.youtube.com/user/thang010146/about.
5. 5. J. Soss, “Hinge,” US1484093A, 1924. Available: https://patents.google.com/patent/US1484093A/en