Epimorphic covers make RG+ a site, for profinite G.
Davis, Daniel G.
Theory and Applications of Categories [electronic only], Tome 22 (2009), p. 388-400 / Harvested from The Electronic Library of Mathematics
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Publié le : 2009-01-01
EUDML-ID : urn:eudml:doc:228656 
@article{05636676,
     title = {Epimorphic covers make },
     journal = {Theory and Applications of Categories [electronic only]},
     volume = {22},
     year = {2009},
     pages = {388-400},
     zbl = {1185.55009},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05636676}
}

Davis, Daniel G. Epimorphic covers make . Theory and Applications of Categories [electronic only], Tome 22 (2009) pp. 388-400. http://gdmltest.u-ga.fr/item/05636676/