crisanto, bernardus, and Michael Novianto. “THEORETICAL CALORIFIC VALUE ANALYSIS OF BRIQUETTE TEST RESULTS OF VARIATIONS OF BASIC MIXTURES OF ROBUSTA AND ARABIKA COFFEE”. Mechanical, Energy and Material (METAL) 2, no. 1 (June 30, 2024): 01–06. Accessed April 26, 2025. https://ejournal.widyakarya.ac.id/index.php/metal/article/view/84.