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Gulisano, F., Mancini, M., Moretti, P. et al. Virtual-phonon exchange (VPE) in rare-earth ethyl sulfates. Lett. Nuovo Cimento 10, 448–450 (1974). https://doi.org/10.1007/BF02816882
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DOI: https://doi.org/10.1007/BF02816882