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@article{MAN_1988__282_2_164452, author = {Walter Roelcke and Martin Leischner}, title = {On {Neutral} {Subgroups} of {Topological} {Groups.}}, journal = {Mathematische Annalen}, pages = {113--130}, publisher = {mathdoc}, volume = {282}, number = {2}, year = {1988}, zbl = {0627.22005}, url = {http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164452/} }
Walter Roelcke; Martin Leischner. On Neutral Subgroups of Topological Groups.. Mathematische Annalen, Tome 282 (1988) no. 2, pp. 113-130. http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164452/