Sutaryo, S., A. N. Sempana, C. M. S. Lestari, and A. J. Ward. 2020. “Performance Comparison of Single and Two-Phase Biogas Digesters Treating Dairy Cattle Manure at Tropical Ambient Temperature”. Tropical Animal Science Journal 43 (4): 354-59. https://doi.org/10.5398/tasj.2020.43.4.354.