PETKOVA, P. TETRAHEDRAL COMPLEX OF Cr3+ AND Cr4+ IONS IN Bi12SiO20 . JOURNAL SCIENTIFIC AND APPLIED RESEARCH, [S. l.], v. 2, n. 1, p. 58–65, 2023. DOI: 10.46687/jsar.v2i1.44. Disponível em: https://jsar.ftn.shu.bg/index.php/jsar/article/view/44. Acesso em: 7 nov. 2024.