MATHER, M. Hurewicz Theorems for Pairs and Squares. MATHEMATICA SCANDINAVICA, [S. l.], v. 32, p. 269–272, 1973. DOI: 10.7146/math.scand.a-11462. Disponível em: https://www.mscand.dk/article/view/11462. Acesso em: 4 may. 2024.