George Abuchi Agwu. “Are Investments in Energy Efficiency and Renewable Energy Technologies Complementary? An Econometric Analysis of households’ Environmental Investments”. African Journal of Environmental Economics and Management 5, no. 1 (February 15, 2017): 312–315. Accessed May 9, 2025. https://elixirpublishers.in/index.php/ajeem/article/view/1042.