S. A. A. Nurzati, D. Rhakasywi, and F. Fahrudin, “High Pressure and Long Compression Improve the Quality of Coffee Waste Biopellets : Tekanan Tinggi dan Kompresi Lama Meningkatkan Kualitas Biopellet Limbah Kopi ”, ijins, vol. 26, no. 4, p. 10.21070/ijins.v26i4.1790, Oct. 2025.