GRANADOS, R. From the Kekulé hexagon to electronic theory. Ars Pharmaceutica (Internet), [S. l.], v. 7, n. 3-4, p. 139–146, 1966. Disponível em: https://revistaseug.ugr.es/index.php/ars/article/view/7624. Acesso em: 19 may. 2024.