Umar, B. A., . A. Isah, . F. M. Dandare, A. A. Ahmad, A., A. A. G. Abdullahi, A. G., A. I. Hashimu, . M. I. Sanusi, S. S. Adamu, and M. K. Sani. “Enhancing Biogas Quality and Energy Content through Calcium Hydroxide Treatment: A Study on the Effectiveness of 20% Ca(OH)2 Solution in Improving Methane Content and Reducing Impurities”. International Journal of Science for Global Sustainability, vol. 11, no. 3, Oct. 2025, pp. 31-33, doi:10.57233/ijsgs.v11i3.916.