VÄISÄLÄ, J. Metric duality in Euclidean spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 80, p. 249–288, 1997. DOI: 10.7146/math.scand.a-12620. Disponível em: https://www.mscand.dk/article/view/12620. Acesso em: 27 apr. 2024.