Jassim, H., and A. Khalil. “Enhanced Biogas Production from Rice Husks and Okra Stalks by Co-Digestion With Ostrich Dung and Cow Manure”. The Journal of Engineering Research [TJER], vol. 20, no. 1, Jan. 2024, pp. 12-22, doi:10.53540/tjer.vol20iss1pp12-22.