Syafrudin, Samadikun, B., Wardhana, I., ., R., Humaira, N., & Budihardjo, M. A. (2021). Purification of Biogas From Tofu Waste using Zeolite and Activated Carbon (AC) as Adsorbent. Global NEST Journal, 23(4), 491-496. https://doi.org/10.30955/gnj.003906