1. W.T. Read Jr., Dislocations in Crystals (McGraw-Hill, New York, 1953 ).
2. W.G. Johnston and J.J. Gilman, J. Appl. Phys. 30, 129 (1959).
3. A.A. Maradudin, E.W. Montroll and G.H. Weiss, Solid State Physics Supplement 3, Theory of Lattice Dynamics in the Harmonic Approximation (Academic press, New York 1963).
4. Z.S. Basinski, M.S. Duesbery and R. Taylor, Phil. Mag. 21, 1201 (1970).
5. V. Vitek, R.C. Perrin and D.K. Bowen, Phil. Mag. 21, 1049 (1970).