1. McKeon, D.G.C., Ord, G.N.: Time reversal and a stochastic model of the Dirac equation in an electromagnetic field. Can J. Phys. 82(1) (2004)
2. Wheeler, J.A.: Gravitation. W.H. Freeman, New York (1973)
3. Rindler, W.: Introduction to Special Relativity. Oxford University Press, Oxford (1999)
4. Taylor, E.F., Wheeler, J.A.: Spacetime Physics. W.H. Freeman, New York (1992)
5. Taylor, E.F., Wheeler, J.A.: Exploring Black Holes: Introduction to General Relativity. Addison-Wesley Longman, Reading, Harlow (2000)