@article{MM2_1974__14_154301,
     author = {Winfried Bruns and Udo Vetter},
     title = {Zur {L\"angenberechnung} der {Torsion} \"ausserer {Potenzen.}},
     journal = {Manuscripta mathematica},
     pages = {337--348},
     publisher = {mathdoc},
     volume = {14},
     year = {1974},
     zbl = {0296.13010},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__14_154301/}
}