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 Journal of Pure Science, vol. 22, no. 7, Feb. 2023, pp. 103-8, doi:10.25130/tjps.v22i7.839.