Scale Up Production Indonesian Liquid Propolis From Raw Propolis and Wild Beehive Using Bubbling Vacuum EvaporatorMuhamad Sahlan, Andhika Akhmariadi, Diah Kartika Pratami, Heri Hermansyah and Anondho WijanarkoMATEC Web Conf., 248 (2018) 04001DOI: https://doi.org/10.1051/matecconf/201824804001