The study of bioenergy with molasses raw materials: analysis of potential and problems in its development in East Java, IndonesiaAdang Agustian, Ening Ariningsih, Endro Gunawan and Kurnia Suci IndraningsihE3S Web Conf., 232 (2021) 04005DOI: https://doi.org/10.1051/e3sconf/202123204005