1. Griffith, A. A., The Phenomena of Rupture and Flow in Solids, Phil Trans. Roy. Soc. of London, A 221 (1921), pp. 163–197.
2. Orowan, E., “Fundamentals of Brittle Behavior in Metals”, Fatigue and Fracture of Metals, John Wiley, New York, (1952), p. 154.
3. Irwin, G. R., “Fracture Dynamics”, Fracturing of Metals, ASM publication (1948), pp. 147–166.
4. Irwin, G. R. and J. A. Kies, “Fracturing and Fracture Dynamics Welding J. Res. Suppl., (1952), pp. 95–6-100–5.
5. Irwin, G. R., “Fracture”, Handbuch der Physik, Vol. VI, Springer, Berlin, (1958), pp. 558–590.