Khaled Salhein, C. J. Kobus and Mohamed Zohdy (2025) “Forecasting Geothermal Installation Capacity Worldwide to 2030: Application of an Improved Grey Prediction Model to the Top 10 User Countries”, Geography, Earth Science and Environment: Research Highlights Vol. 8, pp. 64–85. doi: 10.9734/bpi/geserh/v8/4632.