1. Capitelli M.,Dilonardo M., to be published in J. Chem. Phys. (1977).
2. Winkler R., Pfau S., Beitr. Plasmaphys.13 (1973), 273.
3. Chen J., J. Chem. Phys.40 (1964), 3513.
4. Wright A. N.,Winkler C. A., Active Nitrogen, New York 1968.
5. Herzberg G., Molecular spectra and Molecular Structures I, London 1950.