@article{MM2_1985__51_155072,
     author = {Bruno Zimmermann},
     title = {Nielsensche {Realisierungss\"atze} f\"ur {Seifertfaserungen.}},
     journal = {Manuscripta mathematica},
     pages = {225--242},
     publisher = {mathdoc},
     volume = {51},
     year = {1985},
     zbl = {0584.57025},
     url = {http://geodesic.mathdoc.fr/item/MM2_1985__51_155072/}
}