ARGYROS, I. K. NEW SUFFICIENT CONDITIONS FOR THE APPROXIMATION OF DISTINCT SOLUTIONS OF THE QUADRATIC EQUATION IN BANACH SPACES. Tamkang Journal of Mathematics, [S. l.], v. 24, n. 4, p. 355–372, 1993. DOI: 10.5556/j.tkjm.24.1993.4508. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4508. Acesso em: 24 apr. 2024.