Luca, Dumitru, et al. “An XPS Study of RF Sputtered Ti1-XFexO2 Thin Films”. Journal of Automation, Mobile Robotics and Intelligent Systems, vol. 3, no. 4, Jan. 2013, pp. 15-17, https://jamris.d.tomp.pl/index.php/JAMRIS/article/view/34.