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References
Jürgen Ehlers
(1979)., Einstein's theory of gravitation, in H. Nelkowski, R. Schrader & R. Seiler (eds.), Einstein Symposion Berlin, Dordrecht, Springer, pp. 10-35.
(1973)., The nature and structure of spacetime, in J. Mehra (ed.), The physicist's conception of nature, Dordrecht, Springer, pp. 71-91.