1. G. Herzberg, Molecular Spectra and Molecular Structure, Vol. 1: Spectra of Diatomic Molecules (Van Nostrand, New York, 1959).
2. K. P. Huber and G. Herzberg, Molecular Spectra and Molecular Structure, Vol. 4: Constants of Diatomic Molecules (Van Nostrand Reinhold, New York, 1979; Mir, Moscow, 1984).
3. http://webbook.nist.gov/chemistry .
4. B. P. Lavrov, V. P. Prosikhin, and V. I. Ustimov, Izv. Vyssh. Uchebn. Zaved. 29(2), 66 (1986).
5. N. Åslund, Ark. Fys. 30(25), 377 (1965).