Zangouei, M., A. Z. Moghaddam, and M. Arasteh. “The Influence of Nickel Loading on Reducibility of NiO/Al₂O₃ Catalysts Synthesized by Sol-Gel Method”. Chemical Engineering Research Bulletin, vol. 14, no. 2, Nov. 2010, pp. 97-102, doi:10.3329/cerb.v14i2.5052.