@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/