Simple synthesis, structural and optical properties of cobalt ferrite nanoparticlesA. V. Ravindra, M. Chandrika, Ch. Rajesh, Pratap Kollu, Shaohua Ju and S. D. RamaraoEur. Phys. J. Plus, 134 6 (2019) 296DOI: https://doi.org/10.1140/epjp/i2019-12690-2