Petkova, Petya, Petko Vasilev, and Genoveva Nedelcheva. “THE COMPLEXES OF Co2+ IN Bi12SiO20 AND Co3+ IN Bi12TiO20”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH 3, no. 1 (March 5, 2023): 78–83. Accessed November 7, 2024. https://jsar.ftn.shu.bg/ojs-3.3.0-7/index.php/jsar/article/view/67.