CHRISTENSEN, Jens Peter Reus. Remarks on Namioka spaces and R. E. Johnson’s theorem on the norm seperability of the range of certain mappings. Mathematica Scandinavica, Berkeley, CA, United States, v. 52, p. 112–116, 1983. DOI: 10.7146/math.scand.a-11998. Disponível em: https://journals.msp.org/mscand/article/view/1620. Acesso em: 25 jul. 2026.