@article{MZ_1977__155_172544,
     author = {Gerhard Rosenberger},
     title = {\"Uber {Gruppen} mit einer definierenden {Relation.}},
     journal = {Mathematische Zeitschrift},
     pages = {71--78},
     year = {1977},
     volume = {155},
     zbl = {0342.20015},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__155_172544/}
}