1. Friction based technologies for joining and processing;Thomas,2001
2. W.M. Thomas, E.D. Nicholas, J.C. Needham, M.G. Murch, P. Templesmith, C.J. Dawes, Friction Stir Butt Welding, G B Patent Application No. 9125978.8, Dec. 1991; S.S. Patent No. 5460317, Oct., 1995.
3. W.M. Thomas, E.D. Nicholas, R.E. Dolby, C.J. Jones, R.H. Lilley, Friction Plug Extrusion, International Patent PCT/GB92/01540.21.8.92.
4. The third-body approach: A mechanical view of wear