MANDAL, S. On an Erdős–Straus type problem. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 26, p. 5–17, 2026. Disponível em: https://studmath.uken.krakow.pl/article/view/12935. Acesso em: 21 jul. 2026.