BABU, G. V. R.; ALEMAYEHU, G. N. Fixed points of nodal contractions in cone metric spaces. Tamkang Journal of Mathematics, [S. l.], v. 42, n. 1, p. 39–51, 2011. DOI: 10.5556/j.tkjm.42.2011.595. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/595. Acesso em: 6 jul. 2022.