Eco-efficiency Level of Production Process of Waste Cooking Oil to be Biodiesel with Life Cycle AssessmentSri Hartini, Diana Puspitasari, Nabila Roudhatul Aisy and Yusuf WidhartoE3S Web Conf., 202 (2020) 10004DOI: https://doi.org/10.1051/e3sconf/202020210004