1. C. C. Koch, I. A. Ovid’ko, S. Seal, and S. Veprek, Structural Nanocrystalline Materials: Fundamentals and Applications (Cambridge Univ. Press, Cambridge, 2007).
2. D. R. Clarke, Annu. Rev. Mater. Sci. 17, 57 (1987).
3. G. P. Cherepanov, Mechanics of Brittle Fracture (Nauka, Moscow, 1974; McGraw Hill, New York, 1979).
4. N. F. Morozov, Mathematical Problems of the Theory of Cracks (Nauka, Moscow, 1984) [in Russian].
5. J. P. Hirth and J. Lothe, Theory of Dislocations, 2nd ed. (Wiley, New York, 1982; Atomizdat, Moscow, 1972).