M. HAMID, J. Synthesis, Characterization Of Various Coumarin Derivatives. Journal of Education and Science, [S. l.], v. 26, n. 2, p. 74–82, 2013. DOI: 10.33899/edusj.2013.89811. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41449. Acesso em: 10 sep. 2025.