Loan, T., & 		Long, N.
(2014).
 Optical Properties of Anatase and Rutile TiO2:Cr3+ Powders.
<em>VNU Journal Of Science: Mathematics - Physics, 30</em>(2).
Retrieved from <a href="https://js.vnu.edu.vn/MaP/article/view/743" target="_new">https://js.vnu.edu.vn/MaP/article/view/743</a>