1. Mass discrimination
2. R.S. Sigmond, Proceedings of the Third Intenational Symposium on Gaseous Dielectrics, Knoxwille, 1982, p. 92.
3. P.S. Gardiner, J.D. Craggs, Proceedings of the Fifth International Conference on Gas Discharges and their Applications, Liverpool, 1978, p. 81.
4. Negative ions in Trichel corona in carbon dioxide and oxygen