S. Sutaryo, R. Adiwinarti, D. Sahrudi, M. M. Huda, F. H. Himawan, and A. J. Ward, “Anaerobic digestion co-substrate of dairy cow manure and tofu cake: focusing on mixing organic ratio”, JEELM, vol. 30, no. 4, pp. 493–499, Dec. 2022.