References
- Davydov , AS . 1965 . Quantum Mechanics, , 2nd , Oxford : Pergamon .
- Messiah , A . 1968 . Quantum Mechanics , Vol. II , New York : Wiley .
- Grant , IP . 2006 . Relativistic Quantum Theory of Atoms and Molecules , New York : Springer .
- Dyall , KG and Fægri , K . 2007 . Introduction to Relativistic Quantum Chemistry , New York : Oxford University Press .
- Weinberger , P . 2008 . Phil. Mag. , 88 : 2585
- Berestetskii , VB , Lifshitz , EM and Pitaevskii , LP . 1989 . Quantum Electrodynamics, , 2nd , Oxford : Pergamon Press .
- Dirac , PAM . 1936 . Proc. R. Soc. Lond. A , 155 : 447
- Fierz , M and Pauli , W . 1939 . Proc. R. Soc. Lond. A , 173 : 211
- Varlamov , VV . 2007 . Int. J. Theor. Phys. , 46 : 741
- Dirac , PAM . 1928 . Proc. R. Soc. Lond. A , 117 : 610
- Dirac , PAM . 1930 . Proc. R. Soc. Lond. , A126 : 360