1. Coulomb Interactions in particle Beams;Jansen,1990
2. Electron Optics;Klemperer,1971
3. E. Munroe, to appear in the proceedings of SPIE'99 conference on charge particle optics.
4. L. Han, W. D. Meisburger, R. F. Pease, G. I. Winograd, to appear in the proceedings of SPIE'99 conference on charge particle optics.