Ammar A. Dawood, Emaad M. Awsaj and Alaa S. Ateaa (2023) “The preparation of ‘ salicylic acid azo 2,2,4,4 tetrahydroxybenzophenon’ dye using Dowex in the acidic form as a catalyst”, Tikrit Journal of Pure Science, 22(7), pp. 103–108. doi: 10.25130/tjps.v22i7.839.