Rabiu A. Abubakar, Sani Umar Haruna, Saidu Abdu Kadawa, Ozor Marcellinus Chijiume, and AliyuUsman Ibrahim, “Performance Evaluation of a Low-Cost Charcoal, Iron Filings, and Chalk Three-Stage Biogas Scrubbing System for Sustainable Green Building Energy Applications”, Scientificjournal, vol. 1, no. 01, pp. 19–27, Jul. 2026.