Hidayat, Muhammad, Nasri Bachtiar, Sjafrizal Sjafrizal, and Elvina Primayesa. 2023. “The Influence of Investment, Energy Infrastructure, and Human Capital Towards Convergence of Regional Disparities in Sumatra Island, Indonesia; Using Oil and Gas Data and Without Oil and Gas”. International Journal of Energy Economics and Policy 13 (4):139-49. https://doi.org/10.32479/ijeep.14117.