NAHEED, S.; BANO, A. Fixed point and coincidence point theorems. Tamkang Journal of Mathematics, [S. l.], v. 43, n. 1, p. 27–32, 2012. DOI: 10.5556/j.tkjm.43.2012.775. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/775. Acesso em: 6 jul. 2022.