The physical foundations of general relativity, 2026-02-15T23:26:59+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Sciama, D. W. (Dennis William), 1926- (Doubleday, 1969)