Barcz, Eugeniusz. “Application of Banach Contraction Principle to Approximate the Golden Number”. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia 12 (December 29, 2020): 31–38. Accessed April 3, 2025. https://didacticammath.uken.krakow.pl/article/view/8350.