GUNAWAN, H. A note on Dragomir-Mcandrew’s trapezoid inequalities. Tamkang Journal of Mathematics, [S. l.], v. 33, n. 3, p. 241-244, 2002. DOI: 10.5556/j.tkjm.33.2002.241-244. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/326. Acesso em: 29 may. 2022.