GUDRINIECE, E.; STRĒLE, M.; SKUJIŅŠ, V. Environment Friendly Biodiesel Fuel in Latvia. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, Rezekne, Latvia, v. 1, p. 92–95, 2006. DOI: 10.17770/etr2003vol1.1989. Disponível em: https://journals23.rta.lv/index.php/ETR/article/view/1989.. Acesso em: 28 apr. 2025.