1. B. P. Lavrov and S. A. Astashkevich, Opt. Spektrosk. 86, 946 (1999) [Opt. Spectrosc. 86, 845 (1999)].
2. S. A. Astashkevich and B. P. Lavrov, Opt. Spektrosk. 92, 988 (2002) [Opt. Spectrosc. 92, 818 (2002)].
3. M. Mizushima, The Theory of Rotating Diatomic Molecules (Wiley, New York, 1975).
4. H. Lefebvre-Brion and R. W. Field, Perturbations in the Spectra of Diatomic Molecules (Academic, New York, 1986).
5. F. H. Crawford, Rev. Mod. Phys. 6, 90 (1934).