BARCZ, Eugeniusz. A new proof and consequences of the fixed point theorem of Matkowski. Annales Mathematicae Silesianae, [S. l.], v. 35, n. 2, p. 149–157, 2021. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/13442. Acesso em: 18 apr. 2025.