1. Thomas WM, Nicholas ED, Needham JC, Murch MG, Temple-Smith P, Dawes CJ. Improvements relating to friction stir welding. European Patent Specification 0615480B1; 1991
2. Hori H, Makita S, Hino H. Friction Stir Welding of Rolling Stock for Subway. 1st International Symposium on Friction Stir Welding; 1999 Jun; Rockwell Science Center, CD-ROM; 1999
3. Kawasaki T, Makino T. Application of friction stir welding to the manufacturing of next generation ‘A-train’ type rolling stock. 2nd International Symposium on Friction Stir Welding; 2000 Jun; Gothenburg, CD-ROM; 2000
4. Larsson H, Karlsson L. Joining of dissimilar Al alloys by friction stir welding. 2nd International Symposium on Friction Stir Welding; 2000 Jun; Gothenburg, CD-ROM; 2000