@article{MZ_1970__118_171434,
     author = {Karl W. Gruenberg},
     title = {\"Uber die {Relationenmoduln} einer endlichen {Gruppe.}},
     journal = {Mathematische Zeitschrift},
     pages = {30--33},
     publisher = {mathdoc},
     volume = {118},
     year = {1970},
     zbl = {0213.30303},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__118_171434/}
}