PATIL, D. P.; TAMONE, G. On type sequences and Arf rings. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 6, p. 35–50, 2007. Disponível em: https://studmath.uken.krakow.pl/article/view/13278. Acesso em: 31 oct. 2026.