@article{MZ_1959__71_169814,
     author = {Reinhold Baer},
     title = {Kriterien f\"ur die {Abgeschlossenheit} endlicher {Gruppen.}},
     journal = {Mathematische Zeitschrift},
     pages = {325--334},
     year = {1959},
     volume = {71},
     zbl = {0092.02401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1959__71_169814/}
}