1. M.F. Ashby:Phil. Mag., 1966, vol. 14, p. 1157.
2. L. M. Brown and R. K. Ham:Strengthening Mechanisms in Crystals, A. Kelly and R. B. Nicholson, eds., published by Elsevier, 1971, ch. 2, p. 9.
3. M.F. Ashby and R. Ebeling:Trans. TMS-AIME, 1966, vol 236 p. 1396.
4. D.B. Hirsch and F. J. Humphreys:The Physics of Strength and Plasticity, A. S. Argon, ed., M.I.T. Press, 1979.
5. V. Gerold: “Precipitation Hardening”, Chapter 15, Volume 4,Dislocations in Solids, F. R. N. Nabarro, ed., published by North Holland, 1979.