Mujianto, et al. “INVESTMENT ANALYSIS OF GROOVE ROLLER PRESSURE FEEDER (GRPF) TO IMPROVE PRODUCTION COST EFFICIENCY: A CASE STUDY OF PG TRANGKIL SUGAR FACTORY”. Jurnal Riset Ekonomi Dan Bisnis, vol. 19, no. 2, Aug. 2026, pp. 227-41, https://doi.org/10.26623/jreb.v19i2.15709.