[1] Bohr, N. (1922) The Theory of Spectra and the Atomic Constitution. Cambridge University Press, Cambridge.
[2] Landau, L.D. and Lifshitz, E.M. (1972) Quantum Mechanics (in Russian). Izd. Nauka, Moscow.
[3] Olszewski, S. (2011) Journal of Modern Physics, 2, 1305.
http://dx.doi.org/10.4236/jmp.2011.211161
[4] Olszewski, S. (2012) Journal of Modern Physics, 3, 217.
http://dx.doi.org/10.4236/jmp.2012.33030
[5] Olszewski, S. (2012) Quantum Matter, 1, 127.
http://dx.doi.org/10.1166/qm.2012.1010
[6] Olszewski, S. (2014) Journal of Modern Physics, 5, 1264.
http://dx.doi.org/10.4236/jmp.2014.514127
[7] Tolansky, S. (1948) Hyperfine Structure in Line Spectra and Nuclear Spin. 2nd Edition, Methuen, London.
[8] Ruark, A.E. (1928) Proceedings of the National Academy of Sciences of the United States of America, 14, 322.
http://dx.doi.org/10.1073/pnas.14.4.322
[9] Flint, H.E. (1928) Proceedings of the Royal Society A, London, 117, 630. http://dx.doi.org/10.1098/rspa.1928.0025
[10] Flint, H.E. and Richardson, O.W. (1928) Proceedings of the Royal Society A, London, 117, 637.
http://dx.doi.org/10.1098/rspa.1928.0026
[11] Jammer, M. (1966) The Conceptual Development of Quantum Mechanics. McGraw-Hill, New York.
[12] Slater, J.C. (1967) Quantum Theory of Molecules and Solids. Vol. 3, McGraw-Hill, New York.
[13] Landau, L.D. and Lifshitz, E.M. (1969) Mechanics. Electrodynamics (in Russian). Izd. Nauka, Moscow.
[14] Kittel, C. (1987) Quantum Theory of Solids. 2nd Edition, Wiley, New York.
[15] Onsager, L. (1952) The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 43, 1006-1008.
http://dx.doi.org/10.1080/14786440908521019
[16] Beck, E. (1919) Annalen der Physik, 305, 109-148.
http://dx.doi.org/10.1002/andp.19193651802
[17] Uhlenbeck, G.E. and Goudsmit, S.A. (1925) Die Naturwissenschaften, 13, 953-954.
http://dx.doi.org/10.1007/BF01558878
[18] Matveev, A.N. (1964) Electrodynamics and the Theory of Relativity (in Russian). Izd. Wyzszaja Szkola, Moscow.
[19] Schiff, L.I. (1968) Quantum Mechanics. 3rd Edition, McGraw-Hill, New York.
[20] White, H.E. (1934) Introduction to Atomic Spectra. McGraw-Hill, New York.
[21] Millikan, R.A. and Bowen, I. (1924) Physical Review, 23, 1.
[22] Rubinowicz, A. (1933) Handbuch der Physik. In: Geiger, H. and Scheel, K., Eds., Vol. 24, Part 1, Springer, Berlin.
[23] Rose, M.E. (1961) Relativistic Electron Theory. Wiley, New York.
[24] Avery, J. (1976) Creation and Annihilation Operators. McGraw-Hill, New York.