\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{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.