PITH XIE. Improvement On Operator Axioms And Fundamental Operator Functions. International Journal of Mathematics And its Applications, [S. l.], v. 5, n. 2 - A, p. 125–151, 2017. Disponível em: https://ijmaa.in/index.php/ijmaa/article/view/800. Acesso em: 3 jul. 2024.