Fonseca Vigoya, Marlen, José García Mendoza, and Sofia Orjuela Abril. “Analysis of the Level of Implementation of Programs for the Efficient Use of Energy and Unconventional Sources: Case Study Colombia”. International Journal of Energy Economics and Policy 10, no. 5 (August 10, 2020): 679–686. Accessed August 15, 2022. https://www.econjournals.com/index.php/ijeep/article/view/9713.