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Research (Report Yale 3075-12) supported by the U.S. Atomic Energy Commission under contract AT (11-1)3075.
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Ramond, P. Comment on the Virasoro group in dual-resonance models. Lett. Nuovo Cimento 4, 422–424 (1972). https://doi.org/10.1007/BF02824424
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DOI: https://doi.org/10.1007/BF02824424