@article{MZ_1972__129_171815,
     author = {Herbert Abels},
     title = {Normen auf freien topologischen {Gruppen.}},
     journal = {Mathematische Zeitschrift},
     pages = {25--42},
     publisher = {mathdoc},
     volume = {129},
     year = {1972},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__129_171815/}
}