SAARIMÄKI, M.; SORJONEN, P. Valued Groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 70, p. 265–280, 1992. DOI: 10.7146/math.scand.a-12401. Disponível em: https://www.mscand.dk/article/view/12401. Acesso em: 28 apr. 2024.