1. H.H. Chang, C.E. Han, W.H. Wang, and J.Y. Chen, Radiation Effects 44, 181 (1979)
2. Veeco, Series 2100: Specifications, Austin, Texas
3. Caspar, Challenger 200 MCA: Specifications, Sunnyvale, California
4. R. Allison. Schechter, In Proc. Symp. Electron and Ion Beam Science and Technol, ed. R. Bakish, ( Electrochemical Soc., 1976 ) p. 482
5. G. Ryding, A.B. Wittkower, and P.H. Rose, J.Vac.Sci.Technol. 13, 1030 (1976)