Castellanos, Luis Marcos, Hernan Hernandez-Herrera, Jorge I. Silva-Ortega, Vicente Leonel Martínez Diaz, and Zaid García Sanchez. 2019. “Potential Energy Savings and CO2 Emissions Reduction in Colombia Compressed Air Systems”. International Journal of Energy Economics and Policy 9 (6):71-78. https://econjournals.com/index.php/ijeep/article/view/8084.