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Campana, L.S., D’Auria, A.C., Cesare, L. et al. On the validity of the Bogoliubov approximation for a high-density Bose model. Lett. Nuovo Cimento 24, 147–150 (1979). https://doi.org/10.1007/BF02725841
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DOI: https://doi.org/10.1007/BF02725841