1. Bergia, Silvio (1993). Attemps at Unified Field Theories (1919–1955). Alleged Failure and Intrinsic Validation/Refutation Criteria. In Janssen, M. and Norton, John D., eds. The Attraction of Gravitation. Birkhäuser Boston Earman, Janssen, and Norton, eds., 274–307.
2. Bergmann, Peter G. and Komar, Arthur B. (1962). Observables and commutation relations. In (Royaumont 1962), 309–323.
3. Bertotti, B., Balbinot, R., Bergia, S. and Messina, A., eds. (1990). Modern Cosmology in Retrospect. Cambridge University Press, Cambridge, U.K.
4. Bondi, Hermann (1952). Cosmology. Cambridge University Press, Cambridge, U.K.
5. Copson, Edward T. (1928). On electrostatics in a gravitational field, Proceedings of the Royal Society of London A
118, 184–194.