Ika Putri Sulistiana, Suharyono, Subeki, Medina Alia Rahmawati, Suci Putri Ramadani, and Tesy Pratami. 2026. “Optimization of Fermentation Time and Ghalkoff Microbial Concentration on Organic Robusta Coffee”. Jurnal Bio-Geo Material Dan Energi 6 (2):97-107. https://doi.org/10.22437/j-bigme.v6i2.54165.