WARNER, S. Nonuniqueness of immediate maximal extensions of a valuation. MATHEMATICA SCANDINAVICA, [S. l.], v. 56, p. 191–202, 1985. DOI: 10.7146/math.scand.a-12096. Disponível em: https://www.mscand.dk/article/view/12096. Acesso em: 14 apr. 2025.