1. W.M. Thomas, E.D. Nicholas, J.C. Needham, M.G. Murch, P. Temple-Smith, C.G. Dawes, Friction Stir Butt Welding, G.B. Patent Application No. 9125978.8 (December 6, 1991);
2. W.M. Thomas, E.D. Nicholas, J.C. Needham, M.G. Murch, P. Temple-Smith, C.G. Dawes, Friction Stir Butt Welding, US Patent 5,460,317 (October 24, 1995).
3. R.S. Mishra, Superplastic forming of micro components, US Patent 6,655,575 (December 2, 2003).
4. Effect of friction stir processing on fatigue behavior of A356 alloy
5. Friction stir processing: a tool to homogenize nanocomposite aluminum alloys