1. 10th Int. Conf. on Application of Acceleration in Research and Industry;Dearnaley,1989
2. High Energy Ion Microprobes;Cookson,1987
3. F. Watt and G.W. Grime, private communication.
4. High brightness sources for MeV microprobe applications
5. M. Murrell, C.J. Sofield and S. Sugden, private communication.