الحاج حسينف. “Synthesis and Chractrisation of Di Azo Dyes Using 7-Hydroxy-4-Methyl Coumarin As a Coupling Compound”. Journal of Hama University , Vol. 6, no. 8, Feb. 2024, https://hama-univ.edu.sy/ojs/index.php/huj/article/view/1416.