Structural and dielectric properties of copper-based spinel ferritesHafiz Muhammad Tahir Farid, Ishtiaq Ahmad, Irshad Ali, Asif Mahmood and Shahid M. RamayEur. Phys. J. Plus, 133 2 (2018) 41DOI: https://doi.org/10.1140/epjp/i2018-11832-4