Abstract: The results of the self-consistent phonon theory developed by Plakida and Siklos with the generalized form of the Lennard- Jones (n,m) model of interatomic interactions in the lattice of bcc $+3$/He and ideally hcp $+4$/He are given. Theoretical values for the pressure and temperature variations of the dynamic and thermodynamic function of strongly anharmonic crystals of helium are compared with experimental data. !12
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