TALPONEN, J. Uniform-to-proper duality of geometric properties of Banach spaces and their ultrapowers. MATHEMATICA SCANDINAVICA, [S. l.], v. 121, n. 1, p. 111–120, 2017. DOI: 10.7146/math.scand.a-26166. Disponível em: https://www.mscand.dk/article/view/26166. Acesso em: 19 oct. 2021.