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@article{MZ_1972__124_171658, author = {David L. Winter and Murphy Paul F.}, title = {Groups {All} of {Whose} {Subgroups} are {M-Groups.}}, journal = {Mathematische Zeitschrift}, pages = {73--78}, publisher = {mathdoc}, volume = {124}, year = {1972}, zbl = {0248.20008}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__124_171658/} }
David L. Winter; Murphy Paul F. Groups All of Whose Subgroups are M-Groups.. Mathematische Zeitschrift, Tome 124 (1972), pp. 73-78. http://geodesic.mathdoc.fr/item/MZ_1972__124_171658/