HASSAN, F. effect of lead and nickel on growth and some physiological aspects of Helinthus annus L. Journal of Education and Science, [S. l.], v. 22, n. 2, p. 47–60, 2009. DOI: 10.33899/edusj.2009.57670. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41637. Acesso em: 10 sep. 2025.