E. B. Umoren, A. M. Ekanem, N. J. George, and J. E. Thomas, “A Hybrid AHP-Entropy and K-Means DRASTIC Framework for Geoelectrical-Based Groundwater Vulnerability Mapping in Akwa Ibom State, Nigeria”, REJOST, vol. 6, no. 8, pp. 1–41, Aug. 2026.