KWAPISZ, J. Quasi-symmetry without ratios. MATHEMATICA SCANDINAVICA, [S. l.], v. 125, n. 1, p. 5–12, 2019. DOI: 10.7146/math.scand.a-112190. Disponível em: https://www.mscand.dk/article/view/112190. Acesso em: 3 apr. 2025.