1. K.H. Schwalbe, U. Zerbst, Y.J. Kim, W. Brocks, A. Cornec, J. Heerens, H. Amstutz, EFAM ETM 97 - the ETM method for assessing the significance of crack-like defects in engineering structures (GKSS-98/E/6), GKSS, Germany, 1998 p. 152.
2. British Standard BS7910. Guide on methods for assessing the acceptability of flaws in metallic structures, British Standards Institutions, London, 2005.
3. API 579. Recommended practice for fitness-for-service, American Petrolium Institute, Washington DC, 2000.
4. R6. Assessment of the Integrity of Structures Containing Defects. Gloucester, UK, British Energy Generation Ltd, 2001.
5. SINTAP: Structural Integrity Assessment Procedure for European Industry, Project No BE95-1426. Rotterdam, British Steel, 1999.