Z. D. Umar, N. A. Abd, S. Z. Zulkifli, and M. Mustafa, “Efficiency of Polycyclic Aromatic Hydrocarbons (PAHs) Degrading Consortium in Resisting Heavy Metals During PAHs Degradation”, Int. J. Environ., vol. 7, no. 1, pp. 14–27, Oct. 2018.