1. I. H. Wilson in “Ion beam modification in insulators”, edited by P. Mazzoldi and G. W. Arnold (Elsevier, Amsterdam, 1987) Ch. 7, p. 245.
2. M. Satou andF. Fujimoto,Jpn. J. Appl. Phys. 22 (1983) L171.
3. M. Kiuchi, K. Fujii, T. Tanaka, M. Satou andF. Fujimoto,Nucl. Instr. Meth. Phys. Res. B33 (1988) 649.
4. J. M. E. Harper, J. J. Cuomo, R. J. Gambino andH. R. Kaufman in “Ion modification of surfaces”, edited by O. Auciello and R. Kelly (Elsevier, Amsterdam, 1984) Ch. 4, p. 127.
5. G. K. Wolf, M. Barth andW. Ensinger,Nucl. Instr. Meth. Phys. Res. B37/38 (1989) 682.