1. ISO 6520–1: Welding and allied processes - Classification of geometric imperfections in metallic materials - Part 1: Fusion welding.
2. D. Chauveau, A. Charbonnier, J. Dubresson: Evaluation des défauts et de leur nocivité dans les constructions soudées – Vol 1 Etude générale.
3. FITNET project: Vol 2 FFS Annex–Appendix D NDE Methods.
4. B. Jonsson, G. Dobmann, A. Hobbacher, M. Kassner, G. Marquis: IIW guidelines on weld quality in relationship to fatigue strength - § 7 Inspection, quality control and documentation
5. ISO 9712, Non-destructive testing: Qualification and certification of NDT personnel.