Baba, Alafara A, Oluwaseun Ajibola, Abdullah S Ibrahim, Folahan A Adekola, Ruth O Sanni, and Yunusa Abdulganiyu. 2016. “Upgrading of a Nigerian Ixiolite Ore to Columbite by Sulphuric Acid Treatment”. Metallurgical and Materials Engineering 22 (3):145-54. https://doi.org/10.30544/213.