Chanphavong, Lemthong. “Biodiesel Production from Used Cooking Oil and Cost Appraisal for the Purpose of Reduction in Dependence on Petroleum Oil in Laos”. Future Energy 2, no. 4 (February 27, 2023): 38–43. Accessed September 9, 2026. https://fupubco.com/fuen/article/view/91.