Ridha, Mohanad Jasim Mohammed. 2017. “Process Optimization of Biosorption Hg(II), Cu(II) and Ni(II) Ions onto Dead Anaerobic Biomass Using a Two-Level Full Factorial Design and Response Surface Methodology, Batch Systems”. Al-Nahrain Journal for Engineering Sciences 18 (2): 328-42. https://nahje.com/index.php/main/article/view/198.