1. Proc. Int. Mass Spectrometry Conf.;Freeman,1969
2. also AERE, Harwell, Report R-6354.
3. Proc. Int. Conf. on Electromagnetic isotope separators;Freeman,1970
4. also AERE, Harwell, Report R-6497.
5. Proc. Symp. on Electron and ion beam science and technology;Aitken,1970