1. W. Happer, Rev. Mod. Phys. 44(4), 169 (1972).
2. A. I. Okunevich, in Optical Orientation of Atoms and Molecules (Collection of Papers) (Leningrad, 1987), pp. 65–76 [in Russian].
3. T. G. Walker and W. Happer, Rev. Mod. Phys. 69(2), 629 (1997).
4. S. Micalizio, A. Godone, et al., Phys. Rev. A 73(3), 033414 (2006).
5. N. M. Pomerantsev, V. N. Ryzhkov, and G. V. Skrotskiĭ, Physical Principles of Quantum Magnetometry (Nauka, Moscow, 1972) [in Russian].