Elfallah, Saleh S Saleh, and Hasan Zuhudi Abdullah. 2018. “In Vitro Apatite Deposition on TiO2 Film Derived from Electro-Chemical Treatment on Ti Substrate under Mixed Acid Electrolyte”. International Journal of Integrated Engineering 10 (3). https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/2136.