1. S. Suresh, Fatigue of Materials, second ed., University of Cambridge, UK, 1998, p. 14.
2. A Critical Analysis of Crack Propagation Laws
3. E647-99, Annual Book of ASTM Standards, vol. 03.01, Philadelphia, PA, 1999.
4. K.S. Ravichandran, R.O. Ritchie, Y. Murakami (Eds.), Small Fatigue Cracks: Mechanics, Mechanisms and Applications, Elsevier, New York, 1999.
5. G.E. Vander Voort, Metallography Principles and Practice, McGraw-Hill, New York, 1984, p. 458.