1. Focus Aluminium, Revista Svetsaren, Edited by ESAB, 2000, Vol.54 no. 2.
2. P.F. Mendez, New Trends in Welding in the Aeronautic Industry, Proceedings of the conference New Trends for the Manufacturing in the Aeronautic Industry, San Sebastian, Spain, May 24-25, pp.21-38, 2000.
3. P. Vilaça, L. Quintino, Soldadura por Fricção Linear — O Que a Indústria Portuguesa Precisa e Precisa de Saber, Tecnologia e Qualidade, Revista do ISQ, no 38, Abril/Junho de 2000, pp. 46-57.
4. W. Thomas, E. Nicholas, S. Kallee, Friction Based Technologies For Joining and Processing. Friction Stir Welding and Processing, TMS Fall Meeting-Friction Stir Welding and Processing, Indianapolis, USA, 2001, pp. 3–13.
5. C. Dawes, W. Thomas, Friction Stir Joining of Aluminium Alloys, TWI Bulletin 6, November/December 1995, pp. 124–127.