Siregar N, Marlianto E, Gea S, Motlan . The Effect of Concentration of Structure and Optical Properties of Thin Films Synthesized by Sol-Gel Methods Spin Coating. IJSBAR [Internet]. 2015 May 19 [cited 2024 May 6];22(1):428-34. Available from: https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3975