Bessaoud , M. M., and A. Timmaoui. “The Ecological Efficiency of Green Fuel’s Distribution in NAFTAL Laghouat Using Data Envelopment Analysis (DEA)”. Finance and Business Economies Review, vol. 5, no. 2, Aug. 2021, pp. 320-3, doi:10.58205/fber.v5i2.1001.