M. HAMID, J. Synthesis, Characterization Of Various Coumarin Derivatives. Journal of Education and Science (JES), [S. l.], v. 26, n. 2, p. 74–82, 2013. DOI: 10.33899/edusj.2013.89811. Disponível em: https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23334. Acesso em: 6 aug. 2025.