@article{MZ_1968__106_171024,
     author = {Helmut Lenzing},
     title = {Direkte {Produkte} von freien {Moduln.}},
     journal = {Mathematische Zeitschrift},
     pages = {206--212},
     publisher = {mathdoc},
     volume = {106},
     year = {1968},
     zbl = {0159.04202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__106_171024/}
}