F. D. Eyenaka, E. A. Idiong, S. O. Uwak, and A. A. Udo, “MAPPING OF SUBSURFACE CONTAMINATION ZONE USING 2-D ELECTRICAL RESISTIVITY IMAGING AND VES TECHNIQUE IN ORON, NIGER DELTA, NIGERIA”, GPH-IJAS, vol. 8, no. 6, pp. 42-62, Aug. 2025.