1. Greiner, W. and Reinhardt, J. (2008) Quantum Electrodynamics. Springer Science & Business Media.
2. Zettili, N. (2009) Quantum Mechanics Concepts and Applications. 2nd Edition, John Willy & Sons Ltd., Chichester.
3. Improved Bethe-Heitler formula
4. Nishina, Y., Tomonaga, S. and Sakata, S. (1934) On the Photoelectric Creation of Positive and Negative Electrons. Institute of Physical and Chemical Research.
5. On the stopping of fast particles and on the creation of positive electrons