“Synthesis and Spectral Studies of Some Novel Coumarin Based Disperse Azo Dyes: Studies of Coumarin Based Azo Dyes” (2009) Biological Sciences - PJSIR, 52(3), pp. 117–121. Available at: https://www.v2.pjsir.org/index.php/biological-sciences/article/view/532 (Accessed: 16 March 2026).