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https://archive.org/details/generaltheoryofr0000dira General theory of relativity : Dirac, P. A. M. (Paul Adrien Maurice), 1902- : Free Download,... general theory of relativity https://www.netlib.org/bibnet/authors/d/dirac-p-a-m.html BibTeX bibliography dirac-p-a-m.bib dirac p a m bibtex bibliography