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Campana, L.S., D’auria, A.C., De Cesare, L. et al. Bogolubov approximation as a second-order approximation in the spectral density method. Lett. Nuovo Cimento 26, 301–306 (1979). https://doi.org/10.1007/BF02746613
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DOI: https://doi.org/10.1007/BF02746613