Study of Rendement of Red Ginger Essential Oil from Red Ginger Waste by Using Steam Distillation ProcessWidayat Widayat, Ayu Sofiati Dita, Cahyono Bambang and Satriadi HantoroE3S Web Conf., 73 (2018) 07002DOI: https://doi.org/10.1051/e3sconf/20187307002