Shehu, A. T., Nwankwo, L. I., and Salako, K. A. “Analytic Signal and Spectral Centroid Methods for Interpretation of Magnetic Anomalies: Applicability to the Entire Sokoto Basin, Nigeria”. International Journal of Science for Global Sustainability, vol. 4, no. 1, June 2017, p. 8, https://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/199.