B. S. Qasim, “Conceptual Evaluation of a Small-Scale Gravity-Based Pumped Hydro Storage System with Permanent Magnet Generators (PMG) for Rural Renewable Energy Stabilization in Nigeria”, josrar, vol. 3, no. 2, pp. 37–45, Apr. 2026, doi: 10.70882/josrar.2026.v3i2.163.