M. Umar, A. Ahmed, S. Magaji, and B. Bala, “Electrical resistivity investigation of sub- surface topography of Rafin Bareda Drainage Basin as a tool for cassiterite-columbite exploration in Dutsen-Wai, Nigeria”, Bayero J. Pure App. Sci., vol. 10, no. 2, pp. 209–221, Apr. 2018.