@article{IM_1970__10_142019,
     author = {H. ZIESCHANG},
     title = {\"Uber die {Nielsensche} {K\"urzungsmethode} in freien {Produkten} mit {Amalgan}},
     journal = {Inventiones mathematicae},
     pages = {4--37},
     publisher = {mathdoc},
     volume = {10},
     year = {1970},
     zbl = {0185.05203},
     url = {http://geodesic.mathdoc.fr/item/IM_1970__10_142019/}
}