Yordanov, Stancho, Bojidar Jivov, Vladimir Petkov, Yoanna Kostova, Vanya Dyakova, Mihaela Aleksandrova, and Shaban Uzun. “Investigation of the Surface Features of $$\bf TiO_2/Sm_2O_3$$ Thin Films Prepared by Sol–gel Method”. Proceedings of the Bulgarian Academy of Sciences 79, no. 3 (March 25, 2026): 321–330. Accessed June 6, 2026. https://www.proceedings.bas.bg/index.php/cr/article/view/942.