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Ferrara, S., Grillo, A.F., Parisi, G. et al. The shadow operator formalism for conformal algebra. Vacuum expectation values and operator products. Lett. Nuovo Cimento 4, 115–120 (1972). https://doi.org/10.1007/BF02907130
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DOI: https://doi.org/10.1007/BF02907130