00766nam0-22002771i-450-990001043720403321000104372FED01000104372(Aleph)000104372FED0100010437220000920d1972----km-y0itay50------baengTechniques of Differential Topology in RelativityRoger PenrosePhiladelphiaSIAM1972RelativitàGravità530.11Penrose,Roger<1931- >39346ITUNINARICAUNIMARCBK99000104372040332123-16614078FI1FI1Techniques of Differential Topology in Relativity338375UNINAING01