1. Arianer, J., Cohen, S., Essabaa, S., Frascaria, R. and Zerhouni, O., 1994, Workshop on Polarized Electron Beams and Targets, Les Houches, France, June 7–10 1994, C11.
2. Baum, G. and Koch, U., 1969, Nucl. Insirum. Meth. 71:189.
3. Bell, R.L., 1973, “Negative Electron Affinity Devices”, Clarendon, Oxford.
4. Campbell, D.M., Brash, H.M. and Farago, P.S., 1971, Phys. Lett. 36A:449.
5. Campbell, D.M., Hermann, C, Lampel, G. and Owen, R., 1983, International Symposium on Polarization and Correlation in Electron-Atom Collisions, July 24–26, 1983, University of Munster,22.