BOUDJADAR, S, et al. “THE EFFECT OF IRON CONTENT ON THE PHASE TRANSFORMATION OF TIO2 NANOCRISTALLINE POWDERS PREPARED BY SOL GEL PROCESS”. Sciences & Technology. A, Exactes Sciences, no. 32, Dec. 2010, pp. 43-48, https://revue.umc.edu.dz/a/article/view/19.