00640nam0-22002411i-450-990001155400403321000115540FED01000115540(Aleph)000115540FED0100011554020000920d1962----km-y0itay50------baengGravitationan introduction to current researchby Witten Louiss.l.John Wiley1962Witten,Louis45575ITUNINARICAUNIMARCBK99000115540040332129-I-254741MA1MA1Gravitation336066UNINAING01