Innovative Concrete Mold and Hexaloc Production System for Sustainable Coastal Protection in IndonesiaCandra Irawan, Haryo Dwito Armono, Made Yujiro Semita, Nurul Istiqomah and Alvin A. P. MuhammadBIO Web Conf., 216 (2026) 09003DOI: https://doi.org/10.1051/bioconf/202621609003