1. Murata M., Kato T. Highly improved function and productivity for tube bending by CNC bender. See TubeNet http://www.tubenet.org.uk/technical/nissin.html.
2. Nissin Technical Data Sheet. See http://www.nissin-precision.com/english/Cnc-2.htm.
3. Neugebauer R., Drossel W. G., Lorenz U., Luetz N. HexaBend - a new concept for 3D-free-form bending of tubes and profiles to preform hydroforming parts and endform space-frame-components. In Advanced technology of plasticity 2002, Proceedings of the 7th International Conference on Technology of Plasticity, Yokohama, Japan, 2002, Vol. 2, pp. 1465–1470, ISBN 0–08-379820-1.