@article{MOMA_1978__85_177850,
     author = {Wolfgang Herfort},
     title = {On the {Commutator} {Subgroup} of a {Nonconnected} {Central} {Group.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {49--52},
     publisher = {mathdoc},
     volume = {85},
     year = {1978},
     zbl = {0374.22001},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1978__85_177850/}
}