1. E. Wigner, inJubilee of Relativity Theory (Bern, 1955),Helv. Phys. Acta, Suppl. IV (Birkhäuser Verlag, Basel, 1956), pp. 210–226.
2. E. Kretschmann,Ann. Phys. (Leipzig) 53, 575 (1917).
3. A. Einstein,Ann. Phys. (Leipzig) 17, 891 (1905).
4. H. A. Lorentz,The Theory of Electrons (2nd edn., 1915) (Dover, New York, 1952).
5. E. T. Whittaker,A History of the Theories of Aether and Electricity (Nelson, London, 1951), Vol. 1, Chap. XIII.