Purification of niobium using liquid - liquid extraction. Research, Society and Development, [S. l.], v. 11, n. 9, p. e48411931880, 2022. DOI: 10.33448/rsd-v11i9.31880. Disponível em: https://rsdjournal.org/rsd/article/view/31880. Acesso em: 5 dec. 2025.