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The explicit forms of the broken (by a electric field E, magnetic field H and spatial dispersion of wave vector k) point symmetry groups of a crystal are given. For these groups the dielectric permeability tensors: ε_{ij}(ω, E), ε_{ij}(ω, H) and ε_{ij}(ω, k) - the particular cases of ε_{ij}(ω, E, H, k) - are written out (the susceptibility tensors χ_{ij}(ω, E), χ_{ij}(ω, H) and χ_{ij}(ω, k) take the...
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