B. R. Faleye and  M. I. Titocan and  M. P. Ibitola,  Geoelectical Resistivity Method in Aquifer Characterization at Opic Estate, Isheri-Osun River Basin, South Western Nigeria.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2018, vol. 135(3). 221 - 229
    [viewed 27 May 2020]. Available from: https://publications.waset.org/pdf/10008679.