MENDOZA, José; PAKHROU, Tijani. Characterizations of inner product spaces by means of norm one points. Mathematica Scandinavica, Berkeley, CA, United States, v. 97, n. 1, p. 104–114, 2005. DOI: 10.7146/math.scand.a-14966. Disponível em: https://journals.msp.org/mscand/article/view/731. Acesso em: 25 jul. 2026.