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2. F. Grasso in “Channeling”, Ed. by D.V. Morgan (John Wiley and Sons, London 1973) chap. VII, p. 181.
3. W.K. Chu, M.A. Nicolet and J.W. Mayer,“Backscattering Spectrometry” (Academic Press, N.Y. 1977) chap. VIII.
4. E. Rimini, E. Lugujjo and J.W. Mayer, Phys. Rev. B 6 (1972)718.
5. W.L. Brown in Radiation Damage and Defects in Semiconductors Conf. Ser. n. 16 ( The Institute of Physics, London, 1973 ) p. 416.