1. Hellmann, D., Schwalbe, K.-H.; Geometry and Size Effects on J-R and S-R Curves Under Plane Stress Conditions, 15th National Symposium on Fracture Mechanics, College Park, Maryland, 7–9 July 1982, published in ASTM STP 833, R.J. Sanford, Ed., American Society for Testing and Materials, Philadelphia, 1984, pp. 577–605.
2. Schwalbe, K.-H., Hellmann, D.; Correlation of Stable Crack Growth with the J-Integral and the Crack Tip Opening Displacement, Effects of Geometry, Size, and Material, GKSS-Research Center Geesthacht GmbH, Report GKSS 84/E/37, Geesthacht 1984.
3. British Standard BS 5762:1979, Methods for Crack Opening Displacement (COD) Testing. The British Standards Institution.
4. Ernst, H.A., Presentation at ASTM E24.08 Subcommittee meeting, 18–22 April 1983, Louisville, KY.
5. Landes, J., McCabe, D.E., Ernst, H.A.; Elastic-Plastic Methodology to Establish R-Curves and Instability Criteria, Report RP 1238–2, Westinghouse R&D Center, Monroeville, PA, 1983.