1. General Relativity and Particle Dynamics
2. Relativistic Invariance
3. (a) Quantum Mechanics (Oxford U.P., Oxford, 1930), Chap. 6;
4. (b) Continuous Groups of Transformations (Princeton U.P., Princeton, NJ, 1933), Sec. 1.
5. (a) Mathematical Theory of Relativity (Cambridge U.P., Cambridge, England, 1923), p. 224;