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Work supported in part by CNPq, MINIPLAN and FAPESP.
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Hengeltraub, A., Tenan, M.A., Ramos, J.G. et al. On the Green’s function theory of the Heisenberg ferromagnet with crystal field anisotropy. Lett. Nuovo Cimento 12, 687–691 (1975). https://doi.org/10.1007/BF02753417
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DOI: https://doi.org/10.1007/BF02753417