SZÉKELYHIDI, L. On a paper of T.M.K. Davison. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 2, p. 55–62, 2002. Disponível em: https://studmath.uken.krakow.pl/article/view/13532. Acesso em: 30 oct. 2026.