Developing a food safety model for biogenic silica powder from palm oil boiler ash using soft system methodologyAnni Rohimah, Dadang Surjasa, Rina Fitriana, Engelin Shintadewi Julian, Aton Yulianto and HoerudinBIO Web Conf., 219 (2026) 02003DOI: https://doi.org/10.1051/bioconf/202621902003