Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1979__168_172861, author = {Brian Hartley}, title = {Subgroups of {Finite} {Index} in {Profinite} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {71--76}, publisher = {mathdoc}, volume = {168}, year = {1979}, zbl = {0394.20020}, url = {http://geodesic.mathdoc.fr/item/MZ_1979__168_172861/} }
Brian Hartley. Subgroups of Finite Index in Profinite Groups.. Mathematische Zeitschrift, Tome 168 (1979), pp. 71-76. http://geodesic.mathdoc.fr/item/MZ_1979__168_172861/