Elemental analysis and hardness characterization of fermented green arabica coffee bean using Laser-Induced Breakdown Spectroscopy (LIBS)Beny Sulistyo Hartadi, Rauzatul Ikhwani and Syahrun Nur AbdulmadjidE3S Web Conf., 605 (2025) 03052DOI: https://doi.org/10.1051/e3sconf/202560503052