Baba, A. A., Ajibola, O., Ibrahim, A. S., Adekola, F. A., Sanni, R. O., & Abdulganiyu, Y. (2016). Upgrading of a Nigerian Ixiolite ore to Columbite by Sulphuric acid treatment. Metallurgical and Materials Engineering, 22(3), 145–154. https://doi.org/10.30544/213