“THE UTILIZATION OF BIOGAS SLUDGE BIOCHAR TO LEAD ZERO WASTE SYSTEM IN BIOGAS IMPLEMENTATION: THE EFFECT OF VOLUME ON CARBON DIOXIDE AND METHANE CONTENT” (2021) International Journal of Geomate, 20(79), pp. 119–124. Available at: https://geomatejournal.com/geomate/article/view/237 (Accessed: 13 October 2026).