General relativity
Robert M. Wald · University of Chicago Press · 1984
Wikipedia
{{cite book |last=Wald |first=Robert M. |title=General relativity |publisher=University of Chicago Press |year=1984 |isbn=9780226870335}}
Robert M. Wald · University of Chicago Press · 1984
{{cite book |last=Wald |first=Robert M. |title=General relativity |publisher=University of Chicago Press |year=1984 |isbn=9780226870335}}