Ammar, Saad, and Sadiq Khodhair. 2017. “Anaerobic Digestion and Codigestion of Chlorella Vulgaris Microalgae Biomass With Wastewater Sludge and Dairy Manure for Biogas Production”. Al-Khwarizmi Engineering Journal 13 (3), 18-26. https://doi.org/10.22153/kej.2017.03.001.