Extraction and characterization of yeast extract bioethanol byproduct from empty palm oil bunch for raw material of cosmetic productsMuhamad Sahlan, Muhammad Saefuddin, Muryanto, Heri Hermansyah and Anondho WijanarkoE3S Web Conf., 67 (2018) 03040DOI: https://doi.org/10.1051/e3sconf/20186703040