1. N. Bohr,Atomic Physics and Human Knowledge (Science, New York, 1961).
2. B. S. DeWitt and N. Graham, eds.,The Many-Worlds Interpretation of Quantum Mechanics (Princeton University Press, Princeton, 1973).
3. A. Einstein,The Principle of Relativity (Dover, New York, 1960).
4. H. Arzeliés,Relativistic Kinematics (Pergamon Press, Oxford, 1966).
5. R. F. Marzke and J. A. Wheeler, inGravitation and Relativity, R. Y. Chiu and W. F. Hoffmann, eds. (Benjamin, New York, 1964); J. Ehlers, inRelativity, Astrophysics and Cosmology, W. Israel, ed. (Reidel, Dordrecht, 1973).