1. e.g. see: Adv. At. Mol. Opt. Phys., edited by B. Bederson, H. Walthers (Academic Press, New York, 1994)
2. Electron Molecule Collisions, edited by I. Shimamura, K. Takayanagi (Plenum Press, New York, 1994)
3. Electron Collisions with Molecules, Clusters, Surfaces, edited by H. Ehrhardt, L.A. Morgan (Plenum Press, New York, 1994)
4. S. Trajman, D.F. Register, A. Chutjian, Phys. Rep. 97, 219 (1983)
5. A. Zecca, G.P. Karwasz, R.S. Brusa, Nuovo Cim. 19, 1 (1996)