YUAN, W.; CHEN, D.; KANG, H. Estimation of derivatives for regular positive real part functions. Tamkang Journal of Mathematics, [S. l.], v. 36, n. 3, p. 193–197, 2005. DOI: 10.5556/j.tkjm.36.2005.111. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/111. Acesso em: 29 mar. 2024.