HWANG, T.-S.; YANG, G.-S. ON INTEGRAL INEQUALITIES RELATED TO OPIAL’S INEQUALITY. Tamkang Journal of Mathematics, [S. l.], v. 21, n. 2, p. 177–183, 1990. DOI: 10.5556/j.tkjm.21.1990.4654. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4654. Acesso em: 29 mar. 2024.