Tawfik, W. A. “Methods of Synthesizing of Superparamagnetic Iron Oxide Nanoparticles and Their Surface Modifications for Drug Delivery: A Review”. International Journal of Nanotechnology and Allied Sciences, vol. 1, no. 1, Dec. 2017, pp. 54-60, https://psmjournals.org/index.php/ijnas/article/view/141.