TALPONEN, Jarno. Uniform-to-proper duality of geometric properties of Banach spaces and their ultrapowers. Mathematica Scandinavica, Berkeley, CA, United States, v. 121, n. 1, p. 111–120, 2017. DOI: 10.7146/math.scand.a-26166. Disponível em: https://journals.msp.org/mscand/article/view/309. Acesso em: 24 jul. 2026.