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    Influence of Dy<sup>3+</sup>Ions on the Microstructures and Magnetic, Electrical, and Microwave Properties of [Ni<sub>0.4</sub>Cu<sub>0.2</sub>Zn<sub>0.4</sub>](Fe<sub>2–<i>x</i></sub>Dy<sub><i>x</i></sub>)O<sub>4</sub>(0.00 ≤<i>x</i>≤ 0.04) Spinel Ferrites | NobleBlocks