1. W.M. Thomas, E.D. Nicholas, J.C. Needham, M.G. Murch, P. Templesmith, C.J. Dawes, GB Patent Application No. 9125978.8, 1991.
2. [2] C.J. Dawes and W.M. Thomas: TWI Bulletin 6, 1995, pp. 124-127.
3. [3] R.S. Mishra and Z.Y. Ma: Mater. Sci. Eng. R, 2005, 50: pp. 1-78.
4. W.J. Arbegast, E.R. Coletta, Z. Li, “Characterization of Friction Stir Weld Defect Types”, TMS Annual Meeting and Exhibition, New Orleans, LA, Feb 11–15, 2001.
5. P. Podržaj, B. Jerman and D. Klobčar: Metalurgija. 2015, 54(2): 387-389.