@article{MZ_1963__82_170167,
     author = {Paul S. Mostert},
     title = {Untergruppen von {Halbgruppen.}},
     journal = {Mathematische Zeitschrift},
     pages = {29--36},
     publisher = {mathdoc},
     volume = {82},
     year = {1963},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1963__82_170167/}
}