\bibitem{dennis_hale} J. R. Dennis, E. B. Hale. J. Appl. Phys. 49 (3) (1978) 1119.
\bibitem{hecking1} N. Hecking. Diplomarbeit. Universit"at Dortmund. 1978.
\bibitem{hecking2} N. Hecking, K. F. Heidemann, E. te Kaat. Nucl. Instr. and Meth. B 15 (1986) 760.
+ \bibitem{naguib} H. M. Naguib, R. Kelly. Rad. Eff. 25 (1975) 1.
+ \bibitem{carter} G. Carter, D. G. Armour, S. E. Donnely, R. Webb. Rad. Eff. 36 (1978) 1.
\bibitem{basic_phys_proc} J. K. N. Lindner. Nucl. Instr. and Meth. B 178 (2001) 44.
\bibitem{lindner_appl_phys} J. K. N. Lindner. Appl. Phys. A 77 (2003) 27.
\bibitem{linnross} J. Linnross, R. G. Elliman, W. L. Brown. J. Matter. Res. 3 (1988) 1208.
\bibitem{goetz} J. K. N. Lindner, M. H"aberlen, G. Thorwarth, B. Stritzker. accept. for publ. in Nucl. Instr. and Meth. B (2005).
\bibitem{bean} A. R. Bean, R. C. Newman. J. Phys. Chem. Solids 32 (1971) 1211.
\bibitem{kerningham_ritchie} B. W. Kernighan, D. M. Ritchie. The C programming language 2. ed. Prentice Hall software series, 1988.
+ \bibitem{sha} A. Menzes, P. van Oorschot, S. Vanstone. Handbook of Applied Cryptography. CRC Press, Inc., 1997.
\bibitem{joerg_hecking} J. K. N. Lindner, N. Hecking, E. Te Kaat. Nucl. Instr. and Meth. B. 26 (1987) 551.
+ \bibitem{wong} Dihu Chen, Z. M. Liao, L. Wang, H. Z. Wang, Fuli Zhao, W. Y. Cheung, S. P. Wong. Opt. Mater. 23 (2003) 65.
\end{thebibliography}