1. Thomas W.M., Nicholas E.D., Needham J.C., Murch M.G., Temple-Smith P., Dawes C.J.: Friction stir butt welding, Int. Patent Application No. PCT/GB92/02203; GB Patent Application No. 9125978.8, 1991; US Patent No. 5460317, 1995.
2. Thomas W.M., Nicholas E.D., Needham J.C., Murch M.G., Temple-Smith P., and Dawes C.J.: Improvements relating to friction welding, International Patent Classifications B23K 20/12, B29C 65/06, 1993.
3. Shercliff H.R., Colegrove P.A.: in “Mathematical Modelling of Weld Phenomena 6”, (ed. H. Cerjak, and H.K.H.D. Bhadeshia), 927–974; 2002, London, Maney Publishing.
4. Xu S., Deng X., Reynolds A.P., Seidel T.U.: Sci. Technol. Weld. Joining, 2001, 6(3), 191–193.
5. Seidel T.U., Reynolds A.P.: Sci. Technol. Weld. Joining, 2003, 8(3), 175–183.