Mujianto, Indarto, Rohmini Indah Lestari. 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 [Internet]. 2026 Aug. 30 [cited 2026 Sep. 9];19(2):227-41. Available from: https://journals.usm.ac.id/index.php/jreb/article/view/15709