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Campana, L.S., D’Auria, A.C., De Cesare, L. et al. Decoupling effect in the spectral density approach to an Heisenberg linear chain. Lett. Nuovo Cimento 19, 577–580 (1977). https://doi.org/10.1007/BF02745001
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DOI: https://doi.org/10.1007/BF02745001