Gaber Edris, Walid M. Alalayah, Yahia A. Alhamed, and A.A. AlZahrani. “Modeling Hydrogen Production Using Green Algae Chlorella Vulgaris Utilizing Neural Networks”. International Journal of Advance Engineering and Research Development (IJAERD), vol. 3, no. 2, Feb. 2016, pp. 162-8, https://www.ijaerd.org/index.php/IJAERD/article/view/1246.