1. Hobbacher A. et al.: Fatigue design of welded joints and components. International Institute of Welding, Paris, IIW document XIII-196503/XV-1127-03, Welding Research Council Bulletin 520, 2009, New York, USA
2. ISO 6520: 1982 (EN 26520: 1982), Weld irregularities. International Organization for Standards, Geneva 1982.
3. ISO 5817:2006-10, Quality levels for imperfections. International Organization for Standards, Geneva 2006.
4. British Standards Institution BS 7910: 2004: Guide for methods for assessing the acceptability of flaws in metallic structures.
5. Petershagen H.: The influence of undercut on the fatigue strength of welds — a literature survey. International Institute of Welding, Paris, IIW doc. XIII-1313-89, 1989