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@article{MZ_1972__125_171686, author = {Stewart E. Stonehewer}, title = {Permutable {Subgroups} of {Infinite} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {1--16}, publisher = {mathdoc}, volume = {125}, year = {1972}, zbl = {0219.20021}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171686/} }
Stewart E. Stonehewer. Permutable Subgroups of Infinite Groups.. Mathematische Zeitschrift, Tome 125 (1972), pp. 1-16. http://geodesic.mathdoc.fr/item/MZ_1972__125_171686/