1. R.W. Stanley: Gaseous atomic beam light source. J. Opt. Soc. Am. 56, 350 (1966)
2. W. Demtröder, F. Paech, R. Schmiedl: Hyperfine-structure in the visible spectrum of NO2. Chem. Phys. Lett. 26, 381 (1974);
3. R. Schmiedl, I.R. Bonilla, F. Paech, W. Demtröder: Laser spectroscopy of NO2under very high resolution. J. Mol. Spectrosc. 8, 236 (1977)
4. L.A. Hackel, K.H. Casleton, S.G. Kukolich, S.Ezekiel: Observation of magnetic octopole and scalar spin-spin interaction in 12 using laser spectroscopy. Phys. Rev. Lett. 35, 568 (1975); J. Opt. Soc. Am. 64, 1387 (1974)
5. J.B. Atkinson, J. Becker, W. Demtröder: Hyperfine structure of the 625 nm band in the a3 Hu FX1 Eg transitions fo Nat. Chem. Phys. Lett. 87, 128 (1982); ibid. 87, 92 (1982)