Al-Hemiri, Adil, Ghazi Nejmaldin, and Wadood Mohammed. 2002. “Vapor Phase Oxidation of Benzoic Acid to Phenol Using Nickel-Iron Oxides Catalysts”. Iraqi Journal of Chemical and Petroleum Engineering 3 (4), 13-18. https://ijcpe.uobaghdad.edu.iq/index.php/ijcpe/article/view/646.