Petkova P, Vasilev P, Nedelcheva G. THE COMPLEXES OF Co2+ IN Bi12SiO20 AND Co3+ IN Bi12TiO20. JSAR [Internet]. 2023 Mar. 5 [cited 2024 Dec. 22];3(1):78-83. Available from: https://jsar.ftn.shu.bg/index.php/jsar/article/view/67