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Y. Choquet-Bruhat, Introduction to general relativity, black holes, and cosmology, First edition. Oxford: Oxford University Press, 2015 [Online]. Available: http://ezproxy.library.qmul.ac.uk/login?url=http://www.vlebooks.com/vleweb/product/openreader?id=QMUL&isbn=9780191644528&uid=^u
