00765nam0-22002891i-450-990001078430403321000107843FED01000107843(Aleph)000107843FED0100010784320000920d1962----km-y0itay50------baengGravitationan introduction to current researchEdited by Louis WittenNew YorkJohn Wiley1962RelativitàGravità530.11Witten,Louis45575ITUNINARICAUNIMARCBK99000107843040332123-0193085FI123-019.00113945FI1FI1Gravitation336066UNINAING01