Dirac, P.A.M.; The Quantum Theory of Dispersion
Proc. Roy. Soc. A114 (1927) 710;
Related references More (earlier) information appears in P. A. M. Dirac, Proc. Roy. Soc. A114 (1927) 243;
See also M. Born, W. Heisenberg, and P. Jordan, Z. Phys. 35 (1926) 557;
O. Klein, Z. Phys. 41 (1927) 407;
H. A. Kramers and W. Heisenberg, Z. Phys. 31 (1925) 681;
E. Schrödinger, Annalen der Physik. Leipzig 81 (1926) 109;
W. Gordon, Z. Phys. 40 (1926) 117;
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Foundations of quantum electrodynamics - QED.