1. Balaguer, C., Virk, G., Armada, M.: Robot applications against gravity. In: Robotics & Automation Magazine, March 2006, vol. 13(1), pp. 5–6. IEEE, Los Alamitos (2006)
2. Slocum, H., Awtar, S., Hart, J.: Magnebots: Magnetic Wheels Based Overhead Transportation Concept. In: Conference paper from IFAC Mechatronics 2002, Berkeley (December 2002)
3. Guy, W.: Magnetic Wheel. U.S. Patent 3,690,393 (1972)
4. Sogi, T., Kawaguchi, Y., Morisaki, H., Ohkawa, K., Kai, N., Hayakawa, H.: Inspection robot for spherical storage tanks. In: Industrial Electronics Society. IECON 2000. 26th Annual Confjerence of the IEEE, 22-28 October, 2000, vol. 1, pp. 393–398 (2000)
5. Jireh Industries Ltd: Tripod – a Revolution in Remote Transportation. Industrial product, www.jireh-industries.com/