Mabeyo, Petro E, and Jun Gu. “Coupled Effects of Hydrophilic Nano Silica Oxide and Anatase Nano Titanium Oxide on Strengths of Oilwell Cement”. Tanzania Journal of Science 47, no. 2 (May 27, 2021): 568–582. Accessed October 22, 2021. http://tjs.udsm.ac.tz/index.php/tjs/article/view/649.