1. Vill, V.I, “Friction welding of metals” translated from Russian and published by the American Welding Society, 1962.
2. Wang, K.K., “Friction welding” Welding Research Council Bull (204), April 1975.
3. Andrews, R.E. & Mitchell, J.S., “Underwater Repair by Friction Stir Welding”, Metals & Materials, pp.796–797, December 1990.
4. Nicholas, E.D., “Radial friction welding” Welding Journal, July 1983.
5. Nicholas, E.D. & Thomas, W.M., Weld Journal No. 5, pp. 17–27, 1986.