OBI, J. C.; EZENWA, T. E.; VERA, E. Synthesis Characterization and Biological Activities of 4-Hydroxycoumarin Derivatives. European Journal of Scientific Exploration, [S. l.], v. 2, n. 1, 2019. Disponível em: https://syniutajournals.com/index.php/EJSE/article/view/53. Acesso em: 3 may. 2024.