@article{1102946334, author = {Ulmer, Milton}, title = {$C$-embedded $\Sigma $-spaces.}, journal = {Pacific J. Math.}, volume = {49}, number = {2}, year = {1973}, pages = { 591-602}, language = {en}, url = {http://dml.mathdoc.fr/item/1102946334} }
Ulmer, Milton. $C$-embedded $\Sigma $-spaces.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 591-602. http://gdmltest.u-ga.fr/item/1102946334/