P. A. M. Dirac:The Quantum Theory of the Electron. In: Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character. A, Nr.778, 1928, S.610–624, doi:10.1098/rspa.1928.0023 (Online).
C. D. Anderson:The Positive Electron. In: Physical Review. Band43, Nr.6, 1933, S.491–494, doi:10.1103/PhysRev.43.491 (Online).
P. A. M. Dirac:The Quantum Theory of the Electron. In: Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character. A, Nr.778, 1928, S.610–624, doi:10.1098/rspa.1928.0023 (Online).