Retraction notice to “Factors controlling magnetic properties of CoFe₂O₄ nanoparticles synthesized by chemical co-precipitation: Modeling and optimization using response surface methodology” [Ceram. Int. (2016) 15,818–15,825](S0272884216311129)(10.1016/j.ceramint.2016.07.049)

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the General Editor. The paper plagiarized part of a paper that had already appeared in the Journal of Magnetism and Magnetic Materials 405 (2016) 88–96; http://dx.doi.org/10.1016/j.jmmm.2015.12.031. The co-authors Dr. Ali Ghasemi and Dr. Reza Shoja-Razavi declared that they did not approve the content of this paper before the submission. One of the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. As such this article represents an abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and apologies are offered to readers of the journal that this was not detected during the submission process.