Carlisle, L., and P. B. Crawford. “Comparison of Oil Recoveries Using Carbon Dioxide and Liquefied Petroleum Gas Slugs”. Boletín De Geología, vol. 17, no. 31, May 1983, pp. 15-26, https://revistas.uis.edu.co/index.php/revistaboletindegeologia/article/view/5785.