@article{1256046797, author = {Ledger, A. J. and Razavi, A. R.}, title = {Reduced $\Sigma$-spaces}, journal = {Illinois J. Math.}, volume = {26}, number = {4}, year = {1982}, pages = { 272-292}, language = {en}, url = {http://dml.mathdoc.fr/item/1256046797} }
Ledger, A. J.; Razavi, A. R. Reduced $\Sigma$-spaces. Illinois J. Math., Tome 26 (1982) no. 4, pp. 272-292. http://gdmltest.u-ga.fr/item/1256046797/