Petkova, Petya, Petko Vasilev, and Genoveva Nedelcheva. 2023. “THE COMPLEXES OF Co2+ IN Bi12SiO20 AND Co3+ IN Bi12TiO20”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH 3 (1):78-83. https://doi.org/10.46687/jsar.v3i1.67.