WARNER, Seth. Nonuniqueness of immediate maximal extensions of a valuation. Mathematica Scandinavica, Berkeley, CA, United States, v. 56, p. 191–202, 1985. DOI: 10.7146/math.scand.a-12096. Disponível em: https://journals.msp.org/mscand/article/view/1528. Acesso em: 25 jul. 2026.