Ammar A. Dawood, Emaad M. Awsaj, and Alaa S. Ateaa, “The preparation of ‘ salicylic acid azo 2,2,4,4 tetrahydroxybenzophenon’ dye using Dowex in the acidic form as a catalyst”, Tikrit J. Pure Sci., vol. 22, no. 7, pp. 103–108, Feb. 2023.