[1] S.R. Wilson et al ., Nucl. Instr. Meth., B21 (1987), 433.
[2] S.B. Felch and R.A. Powell , Nucl. Instr. Meth., B21 (1987), 486.
[3] Zhu Dezhang et al ., Nucl. Instr. Meth., B39 (1989), 288.
[4] T.P. Chow Katz and G. Smith , Appl. Phys. Lett., 46 (1985), 41.
[5] J.W. Mayer and E. Rimini , Ion beam handbook for material analysis, Academic Press , New York , 1977.