1. A. Einstein,Ann. Phys. Leipzig 17, 891 (1905).
2. R. Mansouri and R. Sexl,Gen. Rel. Gravit. 8, 497 (1977).
3. Quoted by A. A. Tyapkin,Relatività speciale (Jaca Book, Milano, 1993), p. 67.
4. A. Einstein,Relativity, The Special, The General Theory (Chicago, 1951), p. 18.
5. H. Reichenbach,The Philosophy of Space & Time (Dover, New York, 1958).