Journal ref: International Journal of Automation Technology, Vol.6, No.4 pp. 509-515, 2012
 G. Miller, “Tube Forming Processes: A Comprehensive Guide,” Soc. Manuf. Eng., Michigan, pp. 69-150, 2003.
 M. Murata, “Effects of Die and Material of Circular Tube in MOS Bending Method,” Trans. of Japan Soc. Mech. Eng. Series C, Vol.62, No.601 pp. 292-297, 1996. (in Japanese)
 H. Goto, K. Ichiryu, and Y. Tanaka, “Three-Dimensional Tube Forming Processes with a New Hydraulic Bending Machine Using Parallel Kinematics,” Trans. of The Japan Fluid Power System Society, Vol.41, pp. 74-79, 2010. (in Japanese)
 D. Stewart, “A platform with six degrees of freedom,” Proc. Inst. Mech.Eng., Vol.180, Part 1, No.15, pp. 371-386, 1965.
 L.-W. Tasai, “Robot Analysis: The Mechanics of Serial and Parallel Manipulators,” John Wiley & Sons Inc. New York, pp. 153-154, 1999.